The basic steps depend on where the app comes from
Adding an app means installing software on your computer so you can use it. The steps change depending on whether you read the app from the internet, buy it on a disc, or get it from your operating system's built-in store. Windows, Mac, and Linux each handle installation differently, and the process takes anywhere from a few clicks to a few minutes of following prompts.
Most people today read apps directly from the internet or use their system's app store — the Microsoft Store on Windows, the App Store on Mac, or the software center on Linux. Each method is straightforward once you know which one applies to what you're trying to install.
Key Takeaways
- Apps from the Microsoft Store or Mac App Store install with a single click and update automatically, but they are not the only way to get software.
- Downloaded installer files (usually .exe on Windows or .dmg on Mac) require you to run them and follow setup steps, which typically takes two to five minutes.
- Windows and Mac both warn you if an app comes from an unknown source, and you may need to give permission before installation can proceed.
- After installation, the app appears in your Start menu on Windows or Applications folder on Mac, and you launch it like any other program.
- Uninstalling an app is just as straightforward as installing it — use Add or Remove Programs on Windows or drag the app to Trash on Mac.
Installing from the Microsoft Store or Mac App Store
The easiest way to add an app is through your system's official store. On Windows 10 or 11, open the Microsoft Store app (search for "Microsoft Store" in the taskbar). On Mac, open the App Store from your Applications folder or Launchpad. Search for the app you want, and when you find it, click the button that says "Get" or "Install".
The store handles the read and installation automatically — you do not need to run any separate installer or answer setup questions. Once installation finishes, the button changes to "Open" or "Launch", and you can start using the app when ready. Apps installed this way also update themselves automatically, so you always have the latest version without doing anything.
The trade-off is that store apps are limited to what the store offers. Not every piece of software is available through Microsoft Store or App Store, especially older programs or specialized tools. If you cannot find what you need in the store, you will need to read the installer from the developer's website instead.
Downloading and running an installer file
If an app is not in the store, go to the developer's official website and look for a read button or link. On Windows, this usually downloads a file ending in .exe (like "setup.exe" or "installer.exe"). On Mac, it downloads a .dmg file (a disc image). On Linux, it might be a .deb, .rpm, or a compressed folder depending on your distribution.
Once the file downloads, open it. On Windows, double-click the .exe file and a setup window appears. Follow the prompts — usually you click "Next" a few times, choose where to install the app (the default location is fine for most people), and then click "Install" or "Finish". The whole process takes two to five minutes for most apps.
On Mac, double-clicking a .dmg file opens a window showing the app and an Applications folder. Drag the app icon into the Applications folder. That is the entire installation — no setup wizard, no clicking through prompts. The app is now ready to use.
Handling security warnings and permissions
Windows and Mac both show warnings when you try to install an app from an unknown source — meaning an app that is not from the Microsoft Store or App Store, or one the system has not seen before. This is a safety feature. Read the warning carefully. If you trust the source (you downloaded it from the official developer website), you can proceed.
On Windows, if you see a "User Account Control" dialog asking for permission, click "Yes". If the app is blocked entirely, right-click the installer file, select "Properties", check the box that says "Unblock", and click "explore". Then try running it again.
On Mac, if an app will not open, go to System Settings (or System Preferences on older versions), click "Privacy & Security" or "Security & Privacy", find the app in the list, and click "Open Anyway". You may need to enter your password. This tells Mac you trust the app and want to use it despite the warning.
Finding and launching your newly installed app
After installation finishes, the app appears in your system's menu. On Windows, search for the app name in the taskbar search box, or look in the Start menu under "All Apps". On Mac, open Launchpad (the grid icon in the dock) or go to the Applications folder in Finder. On Linux, the app usually appears in your process menu or launcher.
Click or double-click the app to launch it. The first time you open it, it may take a few extra seconds to start. Some apps ask you to sign in, create an account, or configure settings the first time you run them — follow those prompts if they appear.
To make an app easier to find later, you can pin it to your taskbar on Windows (right-click the app and select "Pin to taskbar") or add it to your dock on Mac (right-click the app in the Applications folder and select "Options" > "Add to Dock").
Removing an app you no longer need
If you want to delete an app, the process is just as straightforward as installing it. On Windows, go to Settings, click "Apps", find the app in the list, click it, and select "Uninstall". Confirm the action and the app is removed.
On Mac, open the Applications folder in Finder, find the app, and drag it to the Trash. Some apps include an uninstaller — if you see one in the Applications folder, you can run that instead. Empty the Trash to permanently delete the app.
On Linux, use your distribution's software center or package manager — the exact steps depend on whether you use Ubuntu, Fedora, or another version, but the principle is the same: find the app and click "Remove" or "Uninstall".
Updating apps after installation
Apps installed from the Microsoft Store or Mac App Store update automatically in the background. You do not need to do anything — the system checks for updates regularly and installs them when available.
Apps you downloaded and installed manually do not always update themselves. Some have a built-in update checker (look in the app's menu for "Check for Updates" or "About"). Others require you to read a new installer from the developer's website and run it again. Check the app's settings or help menu to see how updates work for that particular program.
Frequently Asked Questions
Do I need to restart my computer after installing an app?
Most apps do not require a restart. A few older programs or system-level software might ask you to restart at the end of installation — if the installer prompts you, click "Restart Now" or "Restart Later" depending on what you are doing. If it does not ask, you can start using the app when ready.
What if the installer says the app is already installed?
This usually means a version of the app is already on your computer. You can either uninstall the old version first and then install the new one, or the installer may offer to repair or update the existing installation. Choose whichever option the installer presents.
Can I install the same app on multiple computers?
It depends on the app's license. Most consumer software allows you to install it on a few devices you own personally. Some apps require a separate purchase for each computer. Check the developer's website or the license agreement that appears during installation. Apps from the Microsoft Store or Mac App Store are usually tied to your account and can be installed on multiple devices you own.
Why does my antivirus software warn me about an installer?
Antivirus programs sometimes flag installer files because they modify your system. If you downloaded the installer from the official developer website, it is almost certainly safe. You can tell your antivirus to allow it. If you are unsure about the source, do a web search for the app name plus "safe" or "legitimate" to check whether other people have had the same warning.
What is the difference between installing from the store and downloading an installer?
Store apps are sandboxed — they have limited access to your system and cannot make deep changes. Downloaded installers have more freedom and can modify system files. Store apps update automatically; downloaded apps usually do not. Store apps are generally safer, but not all software is available in stores, so sometimes you have to read an installer instead.