Keynote and Mojave

I have a Mac Pro reliably running Mac OSX Mojave 10.14.6.

I need to run Keynote.

The version I have is 8.0.1, which crashes without fail.

I go to the App Store, and the only version available is Keynote for Mac OSX 10.15.

Well, I have a stable, VERY STABLE system running here; striding the line between 32-bit and 64-bit applications.

I've tried downloading the application via attempting to download an earlier version in the App Store, but nothing happens.

How do I get a version of Keynote which is compatible and available?

I believe the last working version for Mojave was 8.1.