Ok, i have been doing this for a little bit now, and so far it was working at one point for people but now it no longer works even on clean saves and people who have no mods working at all.

I clicked on "Run at Startup" , "Repeatable Stages", in the Quest dialog, i went to the Quest Alias tab and added Unique Actor and selected Player, i attached a script to the player alias...

Now here is the thing it will work on my machine, problem is when you try to pack it up into a BSA and upload it the script is not detected nor wants to be attached to the BSA, so you have to manually add it to the BSA

Now here is the second problem, it will run on some Skyrim machines, and the rest it wont only a select few... any ideas?

Scripts are external files now, so be sure to include it with the mods.

Edit: I misread your post when you said some people had it working.. this may not be the solution.

so the .bsa have to include the .psc source code? you sure?

It only needs the .pex files for the mod to work ingame. If you want people to be able to open up those scripts in an editor you'd need to include the .psc.

also you can do a search on the forum to confirm this...I've seen alot of posts about updating mods causing conflicts with previous versions because of how the game engine handles scripts/how the steam mod service works.