Hi All
I gave up with XAMPP on Windows and I tried it on Ubuntu Server but i got the same issue with Internal Error…
I spend some time on it and finaly found the bug!
There is an error with generating .htaccess in legacy folder. It was fixed on beta. read this:
SuiteCRM 8 Beta - Install Questions - SuiteCRM Forum - English Language / Installation & Upgrade Help - SuiteCRM
I put the correct RewriteBase /public/legacy and it has started working!