BalooRuf
Classically you cannot open a project (project.prel file) created in Premiere Elements Windows in Premiere Elements installed on a Mac computer. And, the reverse is also true.
You can export your Premiere Elements Windows Timeline content to a .mov and .mp4 file, and then be expected to transfer that file to Premiere Elements Mac. Does that work for you? I have never heard of anyone finding an alternative.
ATR