@andreao @pedromoore @Larsjorgensen
- make sure you have enabled registration first in dashboard Settings > General panel, otherwise there won’t be a register page at all
- check dashboard BuddyPress > Pages and ensure that Register and Activate are associated with Pages already
- double-check wp-content/plugins/buddypress/bp-themes/bp-default/registration folder. It should contain register.php and activate.php files. If any are missing, reupload registration folder or re-install BuddyPress manually.