What you need before you start
Before you install anything, you need three things: the installer file itself, permission to make changes to your computer, and enough disk space. The installer file is usually a .exe file on Windows, a .dmg or .pkg file on Mac, or a .deb or .rpm file on Linux. You download it from the publisher's website or an official app store.
On Windows and Mac, you need administrator access — the account that can change system settings. If you are on a shared computer and do not have that access, the installation will fail partway through. On Linux, some installations require you to enter a password to confirm you want to make system-level changes.
Check how much disk space the program needs before you start. Most modern software needs between 100 MB and several gigabytes. You can see your free space by opening File Explorer on Windows (right-click the drive and select Properties) or Finder on Mac (click the drive, then File > Get Info).
Key Takeaways
- Download the installer only from the official website of the company that makes the software, not from third-party download sites.
- On Windows and Mac, you need an administrator account to install most software; on Linux, you may need to enter a password during installation.
- The installation process usually involves clicking through a series of screens where you accept the license agreement and choose where to save the program.
- After installation finishes, restart your computer if the installer asks you to, because some programs do not work until you do.
- If installation fails, check that you have enough disk space, that your account has administrator rights, and that your antivirus software is not blocking the installer.
Installing on Windows
Download the .exe file from the official website. Double-click it to start the installer. Windows may show a security warning asking whether you trust the publisher — click "Run" or "Yes" to continue. If you see a User Account Control dialog asking for permission, click "Yes" to let the installer make changes.
The installer will open a window with setup screens. Read the license agreement (you usually have to check a box saying you accept it), then click "Next" or "Continue" to move forward. Most installers ask where you want to save the program — the default location (usually C:\Program Files) works for almost everything. Some installers also ask whether you want to create a desktop shortcut or add the program to your Start menu; choose what you prefer.
When you reach the final screen, click "Install" or "Finish". The installer will copy files to your computer, which can take anywhere from a few seconds to several minutes depending on the program size. Once it finishes, you may see a checkbox asking whether to launch the program immediately — you can check it or close the window and open the program later from your Start menu.
If the installer asks you to restart your computer, do it. Some programs do not work correctly until the system restarts, even if they seem to open fine beforehand.
Installing on Mac
Download the .dmg or .pkg file from the official website. Double-click it to open it. If it is a .dmg file, a window will appear showing the program icon and an Applications folder. Drag the program icon into the Applications folder. If it is a .pkg file, double-click it and follow the installer screens the same way you would on Windows — accept the license, choose a location, and click "Install".
Mac will ask for your password to confirm you have permission to install. Enter it and click "Install Software". The installation will proceed, and when it finishes, you can close the window. The program is now in your Applications folder and will appear in Spotlight search (press Command + Space and type the program name).
Some Mac programs come as .zip files instead. Double-click the .zip file and it will automatically unzip. Inside you will find the program — drag it to Applications the same way you would with a .dmg file.
Installing on Linux
Linux installation works differently depending on your distribution. Most distributions have an app store or software center where you can search for programs and install them with one click — Ubuntu has Ubuntu Software, Fedora has GNOME Software, and others have similar tools. Open your software center, search for the program, and click "Install". You may need to enter your password to confirm.
If the program is not in your software center, you can download the installer file from the official website. For Debian-based systems like Ubuntu, this is usually a .deb file — double-click it and your software center will open and let you install it. For Red Hat-based systems like Fedora, look for a .rpm file and do the same.
Some programs require you to use the command line. If the website gives you a command to paste into Terminal, open Terminal from your applications menu, paste the command, press Enter, and type your password when prompted. The installation will run automatically.
What to do if installation fails
The most common reason installation fails is not enough disk space. Check your free space again and delete files you do not need, or move large files to an external drive. Then try the installation again.
If you see a permission error, make sure you are logged into an administrator account. On Windows, right-click the installer and select "Run as administrator". On Mac and Linux, you may need to enter your password during installation — if you do not have the password, ask whoever manages the computer.
Antivirus software sometimes blocks installers it does not recognize. If installation stops partway through, check your antivirus program's quarantine folder to see if it blocked the installer. You can temporarily disable antivirus protection while installing, but only if you downloaded the installer from the official website. Re-enable it as soon as the installation finishes.
If the installer itself will not open, the file may be corrupted. Delete it and download it again from the official website. Make sure you are downloading the right version for your operating system — a Windows installer will not work on Mac, and vice versa.
Uninstalling programs you no longer need
On Windows, open Settings, go to Apps > Apps and Features, find the program in the list, click it, and select "Uninstall". Follow the prompts to remove it. Some programs have their own uninstaller in the Start menu — search for the program name and look for an "Uninstall" option.
On Mac, open Finder, go to Applications, find the program, and drag it to the Trash. Some programs come with an uninstaller — double-click it and follow the prompts. Empty the Trash when you are done.
On Linux, open your software center, find the program, and click "Remove". If you installed it from the command line, the software center will still show it and let you uninstall it the same way.
Keeping your software up to date
Most programs check for updates automatically and notify you when a new version is available. You can usually update by clicking a notification or going to Help > Check for Updates in the program menu. Some programs update in the background without asking.
On Windows, you can also check for updates through Settings > Update & Security > Check for updates, which covers Windows itself and some Microsoft programs. On Mac, go to System Settings > General > Software Update. On Linux, your software center usually has an "Updates" section showing which programs have new versions available.
Keep your programs updated because updates often fix security problems and bugs. If a program stops working after an update, you can sometimes roll back to the previous version by uninstalling and downloading an older version from the publisher's website, though this is rarely necessary.
Frequently Asked Questions
Can I install the same program on multiple computers?
It depends on the license. Most consumer software lets you install it on a few computers you own personally. Business software and some subscription programs limit you to one computer per license. Check the license agreement or the publisher's website to see how many computers you can use it on.
What is the difference between installing from an app store and downloading from a website?
App stores like the Microsoft Store and Mac App Store handle updates automatically and make uninstalling simpler. Downloading directly from the publisher's website gives you more control and sometimes newer versions, but you have to update manually. Both are safe if you use the official store or official website.
Do I need to restart my computer after every installation?
Not always. Most modern programs work immediately after installation. The installer will tell you if a restart is necessary — if it does not ask, you probably do not need one. Restarting never hurts, though, and some programs work better after a restart even if the installer does not require it.
Why does my antivirus block the installer even though it is from the official website?
Antivirus software sometimes flags new or less common programs as suspicious because it has not seen them before. If you downloaded from the official website, it is safe to tell your antivirus to allow it. You can also add the publisher's website to your antivirus whitelist so future downloads from them are not blocked.
What should I do if I cannot find the program after installation?
On Windows, search for the program name in the Start menu. On Mac, press Command + Space and type the program name into Spotlight. On Linux, look in your applications menu or software center. If it still does not appear, the installation may have failed — try installing again or check the publisher's website for troubleshooting steps.