help! client footage is OBS recordings, and my NLE gives me unsupported codec on every clip:

Media Import
Unable to decode the selected clip.
C0042.MP4 - H.265 / HEVC, 4:2:2, 10-bit
This format is not supported for decoding on this
system. The clip will appear offline.
I need to start editing today. whats the fastest reliable fix?
im comfortable with simple command line tools if thats what it takes. I just need a reliable fix that wont cost me hours or quality... any reliable workflow tips are very welcome, thank you.