OnVue- Pearson Vue and Catalina 10.15.7 issue?

Are you running any anti-virus software, cleaning/optimizer apps, VPN software, or third party security software? If so, then they may be interfering with the Pearson Vue software. Those types of apps are not needed on macOS so uninstall them by following the developer's instructions. Those types of apps usually cause more problems than they solve since they interfere with the normal operation of macOS.

Otherwise you will most likely need to contact Pearson Vue support for assistance.

FYI, If you click the "Advanced technical requirements" link at the bottom of the page you linked, it actually mentions macOS 10.15. Always gives me confidence in a product/service that is inconsistent in the documentation. Plus very unusual to see macOS 10.15 with no "+" or "and later".

I have seen others trying to use Pearson Vue software....I think they got a bit further and were running later versions of macOS, but I don't recall the details now. OP probably will need to contact Pearson Vue support for assistance.

Hmmm, looks to me like it might be 32 bit only...

Operating System

Window 10 (32-bit and 64-bit) – Live Tiles disabled

Mac 10.13

https://home.pearsonvue.com/Standalone-pages/System-requirements-PVBL.aspx

Thanks. :)