In case you're reading this here are instructions so you can avoid the headache I went through:
There is a new version that you have to download in combination with this one in order to get the audio files it seems.
1. Navigate to '
https://obsproject.com/forum/resources/stream-recording-start-stop-beep-srbeep-unsupported.392/'.
2. Click 'Go to download' to download version 1.
3. Move 'Downloads\SRBeep\windows\obs-studio\data\obs-plugins\SRBeep' to 'C:\Program Files\obs-studio\obs-plugins'.
4. Rename the folder you just moved to 'SRBeep2'.
5. Navigate to '
https://github.com/eebssk1/SRBeep2/releases/tag/v2.2.0'.
6. Download 'SRBeep2.dll'.
7. Move it to 'C:\Program Files\obs-studio\obs-plugins\64bit'.