It's been awhile since I cranked up HL and I'm trying to update it to version 3.5. It says its downloaded but after I hit "ok" to complete the update it never restarts. When I go back into the HL menu it says I still need to update to the newest version (3.5). I'm running Win-7...and since I can't get back into to it I'm not sure what version of HL I'm currently using. Do I need to download the entire HL file and start over?