It is not possible to convert an ACDSee for Windows database to ACDSee for Mac. The two databases are of different schemes.

If you have a version of ACDSee PC that supports Embed Database Information, you can embed the database info in the ACDSee Windows version and Catalog those files in ACDSee for Mac.

In the Window version of ACDSee, please click Tools | Metadata | Embed ACDSee Metadata | Embed in All files. Transfer those files with the embedded ACDSee metadata to the Mac version of ACDSee. In ACDSee for Mac, please click Tools | Catalog Folder to catalog.