Hello can windows 8.1 pro industry be used on a custom pc? or does it have ti be OEM

Solution
You should be able to install just about any version on just about any machine, as long as your product keys are valid, if it's a version that requires product keys.

orlbuckeye

Distinguished
You have a system builder license that is a license where the builder builds the machine to sell to someone else. Then you have a personal license where the builder is building a computer for themselves or upgrading from an OS prior to Windows 8.