Cannot Re-install Painter 20/20 After Crash

I had Painter 20/20 installed and working when I had a crash (random, no apparent reason), so I relaunched and got a “error -24 Please reinstall from original source” (I’m paraphrasing here).

I removed Painter and associated files and reinstalled. Same result. Tried again with the same result.

I created a new user account and attempted to install. The installer hangs 4/5ths of the way through and never closes out.

I’m now out of ways to reinstall Painter 20/20...HELP!

MacOS Mojave 10.14.5

MacBook Pro (Retina, 15-inch, Mid 2014), 2.5 GHz Intel Core i7, 16 GB 1600 MHz DDR3, NVIDIA GeForce GT 750M 2 GB Intel Iris Pro 1536 MB