I have the same problem, need to Create DVD/Blu-rays and I auto-updated to 4.8, not knowing it removed this capability.
I'm pretty afraid of those sketchy download sites, so I've been trying to find workarounds.
I got hold of a MacBook with 13.5.2 (Ventura!) but even it downloaded 4.8.
I can get 7.6.5 via Monterey 12.7, but 7.6.5 won't run on Sequoia.
So it looks like 7.7 is really what is needed here, but I can't figure out the proper macOS version that would allow for something in between 7.6.5 and 7.8.
Any help or ideas?