Questions about uploading a tweaked mod

[Legotrash]

I've tweaked dude2000's HGEC Fighter Growing Pubic Hair mod so NPCs wont be changed (the original contains the "YoungerHotterNPC" mod which changes NPCs faces).The problem is that he hasn't logged in for about a year now (i sent him a message,just in case,in February but offcourse i got no reply) so i can't get his permission for it.Can i upload it anyway?If "yes",please let me know what should i choose under "Permissions and credits" since things are a bit confusing with the original modder being away and all that.

Keep in mind that if i'll get the "green light" the original mod will be a requirement so the original modder can get his credit which he deserves (even if he wont return).

 

Thank you.