Update DLL reference

Easier option to refresh / reload references & types DLL (for example COM interop types) without re-adding all DLLs one-by-one is to reload all projects that reference it like this:

It's better to remove and re-add your references. You said it yourself that the project file was not up-to-date.

I am not sure if there is an add-on for VS that could make updating DLLs easier. If there isn't one, definitely someone should make one. Changing assembly references in large projects is a pain in the @ss.