Many Errors after Importing Demos/Framework

I imported a couple demos/tutorials to learn more and gain access to the assets. I also downloaded the unity explosion framework. I’m not sure what did it, but I now have 33 errors in scripts that I’ve never modified.

~20 are errors like:
Assets/Locomotion System/MotionAnalyzer.cs(64,14): error CS0101: The namespace global::' already contains a definition for MotionAnalyzer’

Most of the others are similar to:
Assets/Scripts/misc/GameManager.js(147,75): BCE0018: The name ‘BlurEffect’ does not denote a valid type (‘not found’).

I’m not sure what to do with those errors, so I tried reimporting all assets and reinstalling, neither of which changed anything.

I’d rather not have save my files to another destination and uninstall/reinstall. I’d also like to be able to import assets/prefabs in the future and not have these issues (or at least know how to fix errors/remove the offending files without taking drastic measures).

Any ideas on how to fix these errors or move forward? Thanks.

Maybe one of those demos already contains explosion files. First error seems to indicate you have 2 MotionAnalyzer classes.