Pagemaker A Indesign

I can do it for you, if you're still looking.

Here's a link which might help:

https://community.adobe.com/t5/indesign-discussions/cannot-open-p65-file-s-in-adobe-indesign-version-17-2-x64/td-p/12857133

If you are lucky, someone from this forum might offer to convert a file for you (not me, I haven't used it for decades).

You need older software from CS6 or earlier
https://helpx.adobe.com/indesign/kb/cant-open-pagemaker-files-indesign.html#:~:text=Open%20the%20PageMaker%20files%20in,Indesign%20can%20open%20the%20files.

There are some online services - not sure how useful they are and they charge

https://www.caretypography.com/converting-pagemaker-to-indesign