Prerequisites

Tracing and log file not applicable, as it is not an issue of the implementation, it is an issue of installing / adding to project.

Description

I wanted to add Github for Unity to my project importing it from the Asset Store. After import I got the message that there is a newer version of it, which I wanted. It took me to a page to download it as a Unity package, so I selected to open it with Unity (in the same project) and import it. This is where the problem happened: the DLL sfw_x64.dll could not be updated, because it got loaded into memory

Steps to Reproduce

1. Import an older version than the latest of Github for Unity to your Unity project
2. Agree to download the newer version and try to import it
3. Observe the error message

Expected behavior: Github for Unity can upgrade without errors OR Asset Store automatically has the latest version (which would eliminate this issue)

Actual behavior: Github for Unity cannot upgrade automatically, because DLLs stay in memory of UNity once loaded

Reproduces how often: 100% (always)

Additional Information

I'm using Unity 2018.2.0f2, tried to import Github for Unity version 1.0.0 (version in Asset Store), newer version is 1.0.2.