I, and i'm sure several other helpers beg you to summarize this next time.
Assuming you mean Roguelike Adventures and Dungeons 2 with RAD2, this was removed because we could never ensure a reasonable experience of playing it due to the large amount of resources it required. This, also being the reason why you can't do that by having each mod seperately installed - which is probably even less optimized than the modpack itself. With that said, it is simply not plausible to run this modpack on a limited host like Aternos.