You should get the Source Unpack : http://wiki.sourceruns.org/wiki/Source_Unpack (Also OoB too works on SteamPipe however some strats requires the Unpack) If you experience any OoB difficulties, ask an OoB runner
No, all versions should be fine. The Unpack that is on the Sourceruns Wiki is always the most up to date version.
No unpacked is more helpful to run because its the old version and the old version had easier glitchs to preform
It's not "unpacked", it's Source Unpack. And as said previously, it's only easier to perform edge glitches and save glitches, not all glitches.
Starting today, runs that require video proof (top 25) and runs beyond that where video is the only form of proof, now require audio, as recording audio for only the game is now a native OBS feature.
