Allow two installations of Blueprint

[tsmaeder]

Feature Description:

The blueprint installer currently always removes any previous version it finds on the system, even when choosing an different installation directory (at least on Windows). This makes it impossible to have more than one version of Blueprint on the system. Beyond curiosity, there are real use cases for having multiple versions: trying out a new version before switching or running plugins with different compatibility, etc.

[jfaltermeier]

Thank you for the report.
I think the electron-builder framework does not support this when using the the nsis installer.
However I guess we could offer a portable standalone app or a zipped version for windows besides the installer.
https://www.electron.build/configuration/win
https://www.electron.build/configuration/nsis
https://www.electron.build/configuration/nsis#portable

[tsmaeder]

This is becoming important for self-hosting: how are we going to fix issues in blueprint if the IDE we're using is blueprint?