?
Good catch, that's a bug on the auto-generated versions page.
Here is a better statement, which we've had for a while on our BuildMaster Roadmap Page:
v4 is semi-retired, which means that we will provide very limited support to v4 users who have not yet upgraded, and will provide assistance in performing upgrades. However, we will no longer ship maintenance releases, patches, or other changes.
I emboldened the key part; we're here to help, so please schedule some time with our engineers to help you upgrade. And for reference, please see KB#1151: Upgrading from BuildMaster v3 and v4