Note, this is not Hostinger support, just the forum for AMP, but we can help with panel-related issues.
If uploading via the web interface is acting weird, use SFTP with something like WinSCP or FileZilla.
Once that’s all good to go, select the right modloader and version.
If things still don’t work, read the log to know what your issue is.
https://discourse.cubecoders.com/t/forge-frequently-asked-questions/2982