How can I open a project in a Unreal Engine Communityversion so its working?

Hello,
I have one problem at the moment:
For my bachelor thesis I need to use a community driven version of UE 4.27 to still access a build with HTML support. My question is what is the best way to open a already existing project in the UE 4.27 version in this community driven version without destroying it. The project that I wanna work on is this car configurator.
Thanks in advance for any help