Pt 10/11 combo download

Hello all....i just downloaded the 10/11 combo...i only have pt11 on my computer as far as i can tell...i want to use pt10...does pt 10 program automatically download with 11 or do i need to download 10 now seperately?...i have an ilok2....also would i need to download instruments for 10 again or can i use AIR with 10? THANX