As mentioned in the Product Grooming Roadmap, starting with Rock v20, the original internal "Rock" theme will be removed as well as the older "V1" versions of the Person Profile pages.

During the Rock v14 update, Person Profile pages received a refreshed design. To protect any customizations your team may have made, a full copy of the original pages was created with “V1” appended to their names.
With many versions and improvements since then, those legacy pages are no longer needed. Removing them helps keep your system cleaner, easier to manage, and aligned with current features.
What’s Being Removed
- The old internal "Rock" theme (
/Themes/Rock/)
- All "V1" Person Profile pages and associated /v1/ routes
- Legacy blocks:
- PersonDetail/BioV1.ascx
- PersonDetail/GroupMembersV1.ascx
- The original PersonDetail layout (replaced by Person Profile Home and Person Profile Detail)