MacOS version link is broken
 

I even tried the .ca copy and that just blows up.

I tried the downloads on Mersenne.org Both the GUI and command line D/L's download fine. (I did not extract them, but the file sizes are ok.)
For Mersenn.ca this link works: [url]https://download.mersenne.ca/gimps/p95v298b6.MacOSX.zip[/url] (I had to navigate to it. It does extract ok.)
The MersenneForum.org mirror works. (But the files don't look to be compressed.)

[QUOTE=dwkc64;573864]I even tried the .ca copy and that just blows up.[/QUOTE]

There will not be a version for the new CPU Macs. You'll need Ernst Mayer's Mlucas for that CPU.

Try this link for version 30.3: [url]https://www.dropbox.com/s/xo7psmmjfkb52pr/p95v303b6.MacOSX.tar.gz?dl=0[/url]

There are issues with version 29 and Catalina. The 30.3 link above might work on that OS.