Yes, you really can still buy Autodesk perpetual licenses in the European Union. You just can’t buy them from Autodesk.
Where can you buy those licenses? From other customers who don’t need them any more. Unlike some jurisdictions, the EU respects the doctrine of first sale for computer software. This means sale of pre-owned software is allowed, and any EULA restrictions attempting to prevent that are invalid. This was established in 2012 by the EU’s highest court, The Court of Justice for the European Union (CJEU) in the case of UsedSoft v Oracle.
Autodesk and all other software vendors in EU countries have to respect that, so the perpetual license remains valid after transfer to the new owner. The previous owner must be able to document the validity of the license and must delete or disable their copy of the software upon transfer.
While I have no personal experience of …