Unable to connect with release candiate viewer

[Jennifer Boyle]

I was curious about the Performance Improvement )Performance Improvements - 6.6.0.569349) Release Candidate viewer, so I downloaded and installed it. When I ran it, a dialog box popped up:

The only way to close it and proceed was to click OK, causing the current official viewer to replace it.

What am I missing? It makes no sense to make a release candidate available and not allow it to be used. There must be some way to connect with it?

[Mollymews]

to use a Linden release viewer we have to enable

Preferences \ Setup \ Software updates\ Willing to update to release candidates

[Jennifer Boyle]

Thank you!