The first thing to do would be to update to the latest Cloudron version. Version 7.7 was released over a year ago.
It doesn't look like an SSL issue though. Where was the Wordpress site you are trying to restore from? The same Cloudron or a different server? If it is a different server it might make more sense to install the LAMP app, extract the files to /app/data/public (checking that the files are owned by www-data), uploading the database dump via PHPmyadmin and then amending the database details in the wp-config file.
