Dassault Systèmes does not sell perpetual licenses to individuals directly. You have three options:
Searching for "CATIA V56R2022 best download" will likely lead to: catia v56r2022 best download
The "best download" is useless if the files are corrupted. After downloading from the official portal, verify the SHA-256 checksum. Dassault provides this on the download page. Dassault Systèmes does not sell perpetual licenses to
Example Command (Windows PowerShell):
Get-FileHash C:\Downloads\CATIA_V5-6R2022.iso -Algorithm SHA256
If the hash matches the one on the DS Portal, your download is perfect. The "best download" is useless if the files are corrupted
I understand you're looking for CATIA V5-6R2022 (often typed as "V56R2022"), but I need to provide an important warning and then guide you properly.