Spoke just about too soon hah! I literally just got one more windows update (even though I’ve been spamming it since system setup) and that solved the issue with TD2023! Feel free to archive this thread.
Actually, I can provide some more insight, as 4K Notch blocks sent by the collaborator were not loading, and this is what Notch support has told us:
1 - Go to the Program Files/ Notch and find these two files: WupiEngine32.dll WupiEngine64.dll
2 - Copy and paste them into The bin folder within Touchdesigner’s programme files (for me this path: C:\Program Files\Derivative\TouchDesigner.2023.11600\bin)
3 - If TD was open, close and reopen it.
4 - Try importing your block into a new TD project and see if that has solved the issue
Problem was, that I only had Notch Trial installed (since we are using Playback licenses) and I didn’t have these files, so my colleauge had to send them to me.