Lost my iMessage when moving from Catalina to Monterey

I'm transitioning from my MacPro 5,1 running DosDudes Catalina (to many bugs), to my Mac Pro 6,1 running Monterey 12.7. But I've lost my iMessage Blue Messages icon(That I use everyday and now all I have is this green icon messages that I have used in the past to contact non-Apple people. I've lost all my people links and conversations. Tried drag and drop with the old App and it crashes on start up. I still get my Apple messages on my iPhone but I use my Mac much more than my phone. I'm not a happy camper, any advice?