Q Light Controller+

I recently started using qlc+ and as a programmer myself I set up a dev environment to mess around
However, I am somewhat confused that qlc 4 and 5 are apparently not using separate branches? It seems that both versions use the same base code, but version 5 is exclusively using qml for generating the ui?

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I just realized now that there exists a dedicated dev section. Unfortunately, that section just appears below the fold Can a mod please move this thread?

QLC+ 4 and 5 share the same engine but have (very) different UIs.
V4 UI is based on QtWidgets, while V5 is based on QtQuick+QML.

Is there documentation about which folders are relevant for which version? I could not find anything.

No, there isn't. Just open the .pro files.

In general:
ui -> QLC+ 4
qmlui -> QLC+ 5

What is that you're looking for exactly?

Well I'm trying to get to understand the code base. I've previously worked with qt for a project ten years ago (qt4) on Linux. Now I'm working on a Windows machine, so both platform and qt5 are new land.