New extruder k2003

hi i have just spent £91 on requiring this new extruder i downloaded the new firmware upgrades only to be told they would only work with Repetier version 0.90 which i find myself unable to download.
Can someone tell me why make a new extruder then make firmware that has you looking for a version of repetier 0.90 that i find unobtainable CAN SOMEONE PLEASE HELP ME.

You can download version our custom repetier version here => k8200.eu/support/downloads/