PrimoCache operates at the kernel level, directly managing disk I/O. A modified (cracked) version can cause:
The file is either corrupt or has been modified (sometimes by antivirus software). Disable real-time scanning temporarily, re-download the original file, and import again.
Romex Software offers a full-featured 60-day trial. No key file needed initially. At the end, you can reset once by emailing support (some users report an additional 30 days). This is 100% legal.
You will be stuck on an old, vulnerable version. Legitimate updates include: