Raspberry-Pi-Installer-Scripts
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Does not work for OSMC
Raspberry pi 4B OSMC x64
its not guaranteed to work on OSMC but you'll get more help if you include details, error messages, screenshots, etc

What are you running this on? Here's where it displays the error message: https://github.com/adafruit/Raspberry-Pi-Installer-Scripts/blob/main/i2samp.sh#L268-L272.
Just after I asked, I realized the issue it's not working is because I don't think it's been tested on a 64-bit OS. It probably just needs some updating now that Raspberry Pi OS has an official 64-bit version.
Maybe.
It's OSMC on a raspberry pi 4B. Arm64