Although I don’t have the answer, I think “previous canary builds” means before 2.0.9.100.
The release note for that had the same words, but it no longer fits in 2.0.9.101, or at least
my 2.0.9.100 can find 2.0.9.101 when I do “Check for updates”. What release are you on?
EDIT:
What’s the Install button supposed to do in this new plan? It doesn’t seem to do anything.