Hi,

Cuildn't find the ObjectDeliever plugin, but we could install VaRest plugin without any problem:

This part of the log suggests that you are trying to install Plugin built for Unreal 5.0 and not Unreal 5.1:

Also, closely follow the documentation here about installing plugins: https://aximmetry.com/learn/virtual-production-workflow/preparation-of-the-production-environment-phase-i/obtaining-graphics-and-virtual-assets/creating-content/creating-content-for-aximmetry-de/ue5-how-to-install-third-party-code-plugins-for-unreal-editor-for-aximmetry/

Warmest regards,