How do i download it every time i try to extract it it gives me errors and i try again and it Disappears

It downloaded, extracted, and loaded perfectly for me and alot of others on the 1st try so chances are you have a software issue or something you need to troubleshoot. Could be many things so post details of the process and what's going on and I or someone else might be able to help you out.

Thats ur useless computer, dont complain Riot's work. Remember this PBE is public, which the 99% of the games doesnt have public beta servers, u only have a 10%/- chance to join not public beta servers. Just if u really want to make LoL a better community try again... (By the way sorry for my bad grammar)

i have the same issue and i don't have a **** computer and i don't save it in a temporary folder