I don't know why STICK didn't help me, maybe because I already had card divided to 2 partitions (it wrote: "Card does not need partitioning" - I understood that Stick doesn't make 2 partitions because I already did it). Now I experimented with low formatted 4GB card - Stick works! Only drag and drop doesn't work. So I tried to repeat all with low formatted 8GB card... now it works!
If I remember well, I had these problems:
1) I could not drag and drop a photo. I had to use "browse..." button.
2) Stick identified my camera from the picture correctly, but it wrote it can't download proper file - I found some "test100a.zip" file. So I renamed file "sx160*.zip" to "test100a.zip".
3) After "install chdk" button it wrote that something was wrong (I don't remember what was wrong) and I can read it in log (I don't remember, what was in log).
Maybe problem was with Comodo firewall that still warned me that this program is unknown and it wants to connect Internet, run to some programs, write to some directories... I allowed all but probably there was too short time limit.