No, that DLL is automatically extracted to temporary folder and loaded so you don't need to install it.

The error says "Access is denied" which means there is a permission problem on the temporary folder. Probably due to insufficient access of your application pool user (or any user if you are impersonating), it cannot read the DLL file.

By default your application pool user should be able to access the temporary folder. In case you had changed it somehow, do this to fix it:

 

This will grant permissions to “Temporary ASP.NET Files” folder as IIS_IUSRS group already has access to it.