my wallet crashes because i haven't updated it to 1.5!

Important security update 1.5.1 https://github.com/byteball/byteball/releases

It removes a XSS vulnerability that allowed remote code injection via specially constructed chat messages.  Thanks @portabella for discovering the bug.
The update also includes a minor performance improvement.

Upgrade is mandatory.

To protect those who didn't upgrade fast enough, I'll update the default hub to refuse connections from clients that run an old version.