Have reviewed your install. It's failing to install due to "Row size too large (> 8126). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.". You're hitting database row size limits for some reason when it tries to create the CBSubs database tables.
I believe it's the _cbsubs_plans table doing this. It has quite a few columns, but the majority are using text types or low byte types so it shouldn't be doing this unless the table already exists, but has wrong column types.
Your database is currently 5.5.5-10.2.33-MariaDB-log. Joomla and CB do not officially support MariaDB. They officially only support MySQL. See the below topic regarding necessary MariaDB version and settings. Your host should be able to help you with updating MariaDB and adjusting the settings.
www.joomlapolis.com/forum/153-professional-member-support/242484-installation-cb-connect-failed?start=12#318734
We have to design around default database settings. Appears your server is using lower than default settings causing row size limit to be hit prematurely. There's nothing more I can suggest unfortunately. The only other option would be to PM phpmyadmin login and I can try forcing it to install by adjusting columns heavily, but that'd only be a temporary solution.