Yes, deactivate BI before doing a rebuild. But before doing that, click on the gear icon on the top left of the console screen and click on "Email Support". That will copy your license information to the clipboard of the PC. Paste that into Wordpad, Notepad or the editor of you choice and make a printout so you have a hard copy of your license number. Then deactivate BI and rebuild. Why you're going to Win11 is up to you, but Win10 works fine for BI and DeepStack.