lightroom 5

Cloud & Win10 https://helpx.adobe.com/creative-cloud/kb/Windows_10_compatibility_FAQ.html

-also, only CURRENT products will be tested and updated for compatibility with Windows 10

-so if you have an older program, you update to Windows 10 at YOUR risk of problems

An idea that MAY work to install and/or run old programs in Windows 10... works for some, not for others

-http://www.tenforums.com/tutorials/15523-compatibility-mode-settings-apps-change-windows-10-a.html

-or Run as Administrator http://forums.adobe.com/thread/969395 to assign FULL permissions... says Encore, but sometimes required for ALL Adobe programs (this is NOT the same as using an Administrator account)