I install from saved dvd folder on another hdd (as i say faster than dvd)
I have to use the EU patch 1.2 (also i keep on hdd)
I have seen guys have problems with uplay/ubisoft updating on auto, hence i manually patch with saved patch
If you can dl the patch for you (i have no idea which one so google)
Save it safe
Install sh5 and if you want german voices choose custom install, you will get a prompt for german voices along the way
Once game is in, patch with hopefully the patch you've now found
Once games patched it will want to update Uplay, either dl Uplay beforehand, or let Uplay auto update, i sometimes do either
That should be a solid patched game then
You can either follow berbsters howto (very good and full howto for sure)
Or wait til later and i sort ts
If i were you, i would go try the above you've just got time to lose and i think you'll get it this time, it should be fine with a manual patch install
At worst i'll be back later
ps : in control panel/programmes add/remove etc whatever os you're using, post back with the Full Details of all dotnet/s and C++ runtimes installed (version numbers i'm after, sh5 don't like a certain C++runtime and gives problems, may as well stop that from the get-go if needbe)