Cannot activate v2.5.7.9

Been using the Premium version for several months. When I upgraded the core to v2.5.7.9, everything broke. Premium and Dropbox are deactivated. When I try to activate, error is: Parse error: syntax error, unexpected end of file in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/sp-client-document-manager/admin/tech.php on line 587

I have not looked into the php because this is a pretty severe side effect of upgrading. Looking for a way to revert to v2.5.7.8 (or earlier).

https://wordpress.org/plugins/sp-client-document-manager/