Here are some common Mastercam post processor download links:
No legitimate, production-ready Mastercam post processor is available via a direct, anonymous download link. mastercam post processor download link
Usually found at C:\Users\Public\Documents\Shared Mastercam 202x . Place the Files: Put the .pst and .psb files in the \mill\Posts folder. Put the .mcam-control file in the \Config or \Tools folder. Here are some common Mastercam post processor download