the kit is designed to run without software it looks like. At 6psi, you shouldn't really have a need to change the software anyway (heck, that's what I think I'm running at without any software upgrade) All you need is a fuel management unit to piggyback until you run some higher boost.
I wouldn't spend a dime on the kit shown though because it looks like you'll end up replacing most of it with new parts anyway (like a bigger turbo, better piping, ecu upgrade, etc etc etc) which will cost thousands more ontop. You might as well just buy a proper kit. Sometimes I wish I bought a properly tuned kit because I am spending at least a couple grand more ontop of what I paid for my s/c kit just to get it working efficiently. Regardless of the extra cost though, in the end it will out perform a stock AA supercharger kit.
'94 Supercharged E36 325is (150,000 original km's)
-Vortech V9 G-Trim @ ~10psi w/ BOV
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)