In February 2010, the 2.0 version of Billable was released and with this release, a name change. If you are new user looking for an invoice application for Mac OS X please check out ProfitTrain.
Billable is no longer supported and does not function with Mac OS 10.10 Yosemite. ProfitTrain can import your Billable information so you can pick up where you left off.
There has been a lot of changes (both big and small) but to highlight some of the major items...
If you need to re-download Billable, it is still available online.