First of all, you must have MetaMod installed on your PC because PODBot is now a MetaMod plugin. If you need help with MetaMod, check the Common Questions forum first - there's a sticky thread about installing MetaMod right on top.
Then you need the last official release - release 2 build 1, as you guessed correctly. This release contains all files you need for PODBot.
Finally, you can download the latest build (R2B43) and replace your podbot.dll with it. afaik, the filebase still calls it a "Beta", but in fact it works better than the old official release...
And no, PODBot won't cause any problems with Steam. You will still be able to...
- connect to Steam servers as before
- use all Steam features as before
- join multiplayer games on any server you like
- play LAN games without bots
Unless you configure PODBot to do so, no bot will join auromatically and mess anything up. The game will load normally, MetaMod will load and run the PODBot plugin, but as long as you don't tell it to do anything, it will just remain peacefully in the background.
Well, good luck with the installation... let us know if it worked or if there are any difficulties we can help you to master!