Hi Anonymyst,
I am really sad reading your bad experience with the demo. I am so sorry...
I own an old PC (about 4/5 years old) but i boosted its capability with 32Go of RAM. The demo is working fine. I am wondering if this problem is linked with the texture size. I am also using a few GPU particles (the waterfall and the torch). Is anyone having any idea of the root cause of this issue?