3,5 hours later and up and running.
This is by far the best installation proces they delivered given the amount of data that had to be installed.
Not a single error on my win10 system en nothing weird has happened.
Everything went just perfect from the beginning to the end.
All in all with extraction taken in to account you do need a big amount of diskspace. (56 Gig install and extract + the actual install itself on the maindrive)
I will try a win 7 install later on the evening and update.
Indeed download was remarkably quick given the size of the package (some 28gb) although I do have a fast, generally reliable connection. I imagine the evenings to be more challenging given the increase in the volume of traffic online. I’ve burned the rar files onto 2 blu ray DVDs. I will also burn a backup of the unpacked files (the unpacking took ages!) to save time if i ever need to reinstall the program. Windows 10.1 here.