Thank you for your answer,.
I installed this 64bit version v10.43 (backed up my old version before).
It is not registered, but allows me to export H.264/265 for now.
Encoder to H.265 is crashing when I try to produce 4K H.265 @ 35 Mbps
Fault bucket 1969144987551476668, type 5
Event Name: RADAR_PRE_LEAK_64
Response: Not available
Cab Id: 0
Problem signature:
P1: x265enc3x64.exe
P2: 0.0.0.0
P3: 10.0.19043.2.0.0
When I try to produce 4K H.265 with default quality (I have no idea what is that, would be good to display at least).
Export starts, but only CPUs are busy, GPU is idling (Encode & Decode at 0%, 3D at 17% but it is Windows).
After 7 minutes of encoding were 9.5% completed (29 seconds of video).
Which makes it (100/9.5) * 7 = ~73 min to finish 100% of work. I stopped here don't see the point to wait more than 1 hour.
Input files and resulting file are on SSD disk.
I have to regretfully admit that after 7 minutes Premiere Pro would export this clip twice, but VideoPAD didn't even reach 10%.