Many resellers are willing to sell you a perpetual license for an older version (e.g., 2013) at a deep discount if you explain your needs. This remains fully legal and supported.
While SolidSquad (often abbreviated as SSQ) became a well-known name in the engineering community for providing "activators" for various high-end design suites, using these tools carries significant legal, professional, and security risks. What is the SolidSquad Activator?