.prel file saved in premiere elements 2023 won't open in premiere pro 2023 on the mac

working with a client who's just learning premiere elements 2023 on a new macstudio with the idea that I'll help him via zoom and then do the final finish in Premiere pro 2023...  I tested the workflow on a windows machine, and I was able to open the .prel in Premiere pro 2023.  Now that we're deep into the editing I figured I'd see if his .prel would open on my new macstudio (the client's working on an identical mac).  Gave me this message when I tried to open it...  But booted up the windows machine and was able to open it and save it as a premiere pro project and then bring that over to the mac...  a royal pain.  Am I missing something?  Luckily I still have the windows machine...