If you can see your virtual machine files or VMDKs in the preview window, the data is recoverable. At this point, purchasing a legitimate license is a guaranteed investment in getting your data back.
If you are dealing with a data loss emergency, the manufacturer suggests a step-by-step approach to ensure your data is actually recoverable before you spend any money: Diskinternals Vmfs Recovery 3.3 Serial Key
Recovering Lost VMFS Volumes: A Guide to DiskInternals VMFS Recovery 3.3 If you can see your virtual machine files
: DiskInternals offers a free evaluation version that allows you to scan your drives and preview all recoverable files . to scan the disk and preview recoverable files—including
to scan the disk and preview recoverable files—including documents, videos, and databases—to verify they are intact. VMFS Recovery™ - DiskInternals
DiskInternals VMFS Recovery is a professional-grade utility designed to recover data from VMware vSphere, ESXi, and VMware Workstation disks. It is specifically engineered to read the —a file system that Windows cannot natively access.