The list of officially supported operating systems that you can install in Parallels virtual machines is available at https://kb.parallels.com/en/124223. For Parallels Desktop for Mac App Store Edition, the list can be located at https://kb.parallels.com/en/123800.
However, other systems may work too. If you need a system that is not listed by the link above, try to install Parallels Desktop, activate a trial period and install it. If the system doesn't work, please let us know at the Parallels Forum (https://forum.parallels.com/forums/parallels-desktop-for-mac-feature-suggestions.769/).
Note: Parallels Desktop does not include operating system installation images. You should acquire them separately.
