Please log into your site via FTP and delete the plugin’s folder:
Your data is safe.
Now, install Connections as you normally would install a plugin.
Apologies for the trouble!
ps. More importantly, you should request that the web host update your site to PHP 7.1. It is must faster and for more resource efficient. PHP 5.6 is on “life support” only receiving security fixes until the end of the year. After that, it will be unsupported and potentially insecure.