I’ve managed to partially get a set of E57 files from a BLK to work in RC. If you import them into recap for ipad and then export to e57 from there, it worked about 50% of the time, though I had to break the scan up into small reconstruction regions.
The problem is that e57 import in general seems pretty broken.
Ive had no issues with PTX point cloud files, though getting Cyclone is really expensive and annoying!