Are you currently using a web.config file? Go to the Logs & Info menu > System Info page and post this information below about your website/server from your System Info page. Go to the BPS Pro > htaccess File Editor menu/page. Do you see displayed messages in blue font that htaccess files are disabled: htaccess Files Disabled: secure.htaccess Master file is disabled.
Server Type: Apache
Operating System: Linux
WP Filesystem API Method: direct
Server API: cgi-fcgi CGI Host Server Type
Apache Modules|Directives|Backward Compatibility(Yes|No)|IfModule(Yes|No): View Visual Test
403: mod_access_compat is Loaded|Order, Allow, Deny directives are supported|IfModule: Yes
403: mod_authz_core is Loaded|Order, Allow, Deny directives are supported|BC: Yes|IfModule: Yes
403: mod_authz_host is Loaded|Order, Allow, Deny directives are supported|BC: Yes|IfModule: Yes
200: mod_rewrite Module is Loaded