The latest version of WordPress supported by MemberMouse is:

WordPress 5.2.x

NOTE - Before upgrading to 5.0, please view our article on What changes can I expect if I upgrade to WordPress v.5.0?

It is always best to have a current site backup before upgrading your version of WordPress.  Your hosting provider should be able to assist you with securing a backup.  

Downgrading to a Previous Version of WordPress

If you've accidentally upgraded to a version of WordPress that is higher than the version we currently support, you can downgrade to the previous version of WordPress by following these instructions:

WordPress Release Archive

Restoring Site from a Backup

If issues were caused by upgrading to an unsupported version of WordPress and the issues persist after downgrading you'll need to restore your site to a latest backup prior to upgrading. If you're unsure about how to do this, your hosting provider should be able to provide some assistance.