Summarize:

This is the web page do download the XAMPP client. XAMPP is available for Windows, Linux, and macOS. Click the download button for whichever system your computer runs on. You will be redirected to a download page and your download will start automatically. If your download does not start automatically, click the green text that says click here at the top of the page. Once the install file is finished downloading, you can open the downloaded file in your web browser or Downloads folder. The install file is "xampp-windows-x64-X.X.X-0-VC15-installer.exe" on Windows, "xampp-osx-X.X.X-0-vm.dmg" on Mac, and "xampp-linux-x64-X.X.X-0-installer.run" on Linux. If you receive an alert that informs you that your Antivirus software may interfere with the installation, temporarily disable your antivirus software and click Yes to continue the installation. When you see the XAMPP installer welcome screen, click Next to continue. XAMPP has a variety of services, including PHP, MySQL, Apache, phpMyAdmin, and more. Click Next to install everything, or uncheck the boxes next to the services you don't want to install and click Next. Here you are asked where you would like to install the personal web server application. The default is to the C:\ drive when installing on a PC. This is probably the best location. To change folder locations, click the icon that resembles a folder and select a folder to install XAMPP to. On Mac, when you see the XAMPP icon with an arrow pointing to the Applications folder, click and drag XAMPP.app to the Applications folder as indicated to copy it to your Applications folder. When you see the information screen about Bitnami, click Next to continue. Once the installation process is complete, click Finish. Click the flag that represents your language (English or German). Then click Save. XAMPP will open automatically once the installation is complete.
Go to https://www.apachefriends.org/index.html in a web browser. Click the link for your operating system. Double-click the install file. Click Next. Select which services you want to install and click Next. Select a folder to install XAMPP to and click Next. Continue clicking Next until XAMPP starts to install. Click Finish. Select your language and click Save.