This process is fragile. A single Windows update can break the crack. If Autodesk changes its license validation protocol (which they do monthly), the crack stops working. You then have to return to FileCR for a "new crack," re-download everything, and start over.
Many users mistakenly believe that because they are not "selling" the software, it is harmless. This is false. Piracy costs the software industry billions annually, and Autodesk actively pursues legal action against commercial users of cracked software.
Revit projects are databases. They are incredibly sensitive to corruption. Cracked versions of Revit often have modified DLL files.
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