Unable to install GoSungrow addon


I am following instructions to install addon in the link below. I am able to add the repo, but install fails with the error. Any help with this would be greatly appreciated

Failed to install add-on

The command ‘/bin/ash -o pipefail -c chmod a+x /usr/local/bin/setup.sh && /usr/local/bin/setup.sh’ returned a non-zero code: 1

I don’t see setup.sh in the above path either