Here are the instructions to open any Active Storage application (Active Admin App, Active Viewer App, ActiveRaid Firmware Updater App and mRAID Firmware Updater App) under OS X Yosemite.
1.”Get info” on the application selected
2. Select “Open in 32-bit mode”
3. Now you will be able to launch the application on OS X Yosemite.
See Download folder for last release of Active Viewer App and Active Admin App.