Hi,
Thanks for quick reply.
In fact, I forgot to mention that I tried on my HDD and then on an SSD, but it did not solve the problem.
Installing previous versions did not make it as well, I installed 6.0, then 5.5, then 5.0.
I did not try to install version 4 because even if it works, it would not be relevant for my training.
it's driving me crazy for 1 week now.
Unfortunately, the cause is elsewhere.