"Copying dll file: access denied" while importing a package

I’m using a plugin in my project and today I got a unity package with an updated version of it. While trying to import that package, I get an error which says: “Copying [path to file and file name here]: access denied”. The file which is throwing that error is a .dll and from what I saw in Sysinternals Process Explorer this .dll is being used by Unity hence I cannot overwrite it.

How do I fix this error and how can I import package in this situation?

This sounds like it’s a OS permissions thing, open your directory in higher privilege’s to copy.