It depends on the license type:
A patcher modifies the xlcompiler executable to bypass license checks. This triggers: xlcompiler activation key
For air-gapped computers (no internet), XLCompiler can generate a machine code. You send that code to the vendor, and they return an offline activation file or key. It depends on the license type: A patcher
If you decide to buy a license, here is the correct activation workflow: Pro tip: Keep your license key in a password manager
Pro tip: Keep your license key in a password manager. DoneEx’s key retrieval system is reliable, but losing the key can cause delays.