cannot update WordPress without curl error 60 ssl certificate. Try to add free plugin Auto install WordPress plugin, does not come in a zip file. Cannot upload the plugin to update the certificate.

cannot edit any pages on the website or add new pages, assume it is because of the update to WordPress although there are NO MESSAGES TO TELL YOU that. please let me know how I can update WordPress. The forum is telling me to contact the website provider BoldGrid.
thank you in advance.