Thanks for posting Michel…!
I think I am going to try this - uninstalling 6.0.5 first, then attempting the 6.5 install. (I am EXACTLY the same as you, as the installation STOPS WORKING at the end of extraction/unpacking and beginning of Setup.exe I presume.
Anyhow, could you explain again about your point 2 and 3 please Michel…? Do I need to run a Setup again to choose where to install the virtual instruments, or does this happen whilst the (same) setup/install is happening…? I’m left a little confused why you felt you needed to mention it and whether I am missing something (maybe its in the translation…! huh…? 
).?
I will look for another folder somewhere called VST Sound and in it I will see the virtual instruments - I install them from there, but to where…? Will the install help me…? You see how confused I can get…!! Ha…! 
Thanks for your time though - and your english is a whole lot better than my french…!! Bravo…!