If you want to test PrimoCache forever, run it inside a Virtual Machine (VMware/VirtualBox). Install the OS, install PrimoCache, take a snapshot. When the trial expires, revert the snapshot. This is perfect for lab testing but useless for your daily gaming PC or workstation.
If your primary goal is to before deciding to purchase, there are legitimate ways to extend the trial period. Romex Software has historically been accommodating to users who need additional testing time.
What are you currently trying to speed up (e.g., HDDs, SATA SSDs, NVMe)?
A widely circulated guide from the Primocache community suggests the following steps:
: Once the period ends, the program prompts you for activation or uninstallation.