upgrading 2011 to 2015 - error Suite Repair Utility could not be installed

I purchased Studio 2015 Freelance Plus last night from the Vendor Portal as an upgrade from 2011 Freelance Plus and downloaded it this morning. I'm running Windows 7 64 bit. The installer stops at the beginning with the error message "Package 'Suite Repair Utility' could not be installed. Error number: -1." 

I read that the issue may be caused by previous versions. So i uninstalled Studio 2011 and all legacy software that i had (Trados 2007, SDLX). But the problem persists. I read somewhere that i should turn off the UAC but that doesn't solve the problem either.  

I saw information about this issue but it was about upgrading 2014 to 2015 not 2011 to 2015. If you can help me with this it would be great!

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