It`s a shame Holger no longer supports or handles registration for Miami, so the only legit way to get a TCP stack is to either buy a second hand copy of Miami, or get the AmigaOS3.9 update ( I never can remember if Genesis was in 3.5 or not !)..or track down someone still selling the NetConnect CD.
BTW, whatever happened to all that stuff about the legality of Genesis a couple of years back..something todo with someone selling rights they didn`t have to H&P