Halo 5 Forge on pc is not going well, nobody knows if they will do any update.
They won’t/can’t. Either way, every update to H5main has broken H5pc even further than it has been since it came out; released broken and each update made it worse. It’s a dead on arrival app, unfortunately. H5main still has a dozen or so stability issues to fix, and their updates to address those issues made them worse; still freezing in the post game lobby and when people join/quit midgame, can’t join games after start despite open spots, etc. I’d give up hope and move to one of the PC Halo games that are much more active and actually work.