Version 4.0.0 still has this issue, not usable with Capture One and DNG.
Use TIF instead.
JPEG, TIFF all work fine, except losing lens correction, this issue is specific to RAW format, Canon and Sony, same problem.
Denoise AI works fine though.
Just to be sure you know, DNG is NOT RAW format. RAW files contain only sensor data, the DNG used by TOPAZ are different from TIFF because they have a profile.
You will need to raise a support request at the main website.