Limitation: This FAQ applies to version 3.0 or higher
If you use Windows: yes, you can install Endless OS and still use Windows. This is called dual boot. Once you install Endless OS, you’ll be able to switch back and forth between Windows and Endless OS each time you restart your computer. You'll need to download and run our installer from https://endlessos.com/. After installation, just restart your computer and select Endless OS. Please see here for step by step instructions.
If you use macOS, Linux or another operating system: we currently do not support dual boot for your operating system. If you install Endless OS, it will replace your existing operating system. We strongly recommend that you try running Endless OS from a USB stick first, or run Endless OS in a virtual machine.