Installation

Unity Hub : https://public-cdn.cloud.unity3d.com/hub/prod/UnityHubSetup.exe

Putty + Pagent : https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

Git : https://git-scm.com/downloads

GitExtensions : https://github.com/gitextensions

Meld : http://meldmerge.org/

Multiple Unity instance : https://support.unity3d.com/hc/en-us/articles/115003118426-Running-multiple-instances-of-Unity-referencing-the-same-project