Upgrading New Versions

WTF......I logged out earlier and went to the forums as instructed and clicked on the link to download the new Second life upgrade version...I got tired of waiting for the download, and went afk for a bit.When i came back and installed the new version, i try and log in and i get a message saying i need to download a new version of second life before i can log in...wtf
so now here i am ...sitting here... again ..whats up with this....? the version I just installed is labeled 1-6-8, ...wait.. don't tell me... they have an update for the update already? lmao

https://secondlife.com/downloads/index.php

1.6.8.(4)

you might need to delete your win temp cache if you get a 23049304903something.tmp.exe error

Well, i had already sat thru waiting while my updated Second Life Thilly, but had really bad lag the first few days, so i decided i would try what You suggested and see if that helped. I went into my hard drive properties and used Disk cleanup(for clearing out space..) and cleaned out the Trmporary internet files and that totally cleared upall the lag i was having!
thanks!