EquiSim ROI 5.0.0.29 has been released.

The registered version can be download per instruction IN YOUR ACTIVATION E-MAIL if you've already purchased/upgraded. For upgrades or purchase, see this page:
http://www.thorotech.com/equisim/purchase.html

This version was necessitated by the infinite wisdom of those who determine track names when they changed the designation of the fall Santa Anita meet from Sa(x) to OSA. While EquiSim will happily handle this track designation (OSA), it will consider it a new, separate track. The overwhelming consensus among EquiSim users is that they would like races run at this OSA meet to be treated as an SA meet so they can use their past database info with it.

So....
When EquiSim sees a track, or past perf, described as OSA it internally treats it as an SA(x) track INTERNALLY. You will still have files with OSA in the names of the files (when you open cards you will open OSA cards).