Alright, big thanks for your help Atracia, it worked for me atleast and I guess it'll for everyone who was STUCKED at 3/4 LoL patcher.
I'll edit it if it gets stucked again but now I'm downoading and this is a good sign afterall.
For the other unlucky fellows just do it as the OP posted it:
1. If you're stucked at 3/4 reinstall is important before the reinstall i had no server unavailable and the curser thing only brought it online, now it is permanently online.
2. If you're stucked again, which will be the case, just extract all the patcher files into your LoL directory and it's done, launch the launcher again - voilà fixed.