Question

Apple iMac Late 2009 model

Mac OS X 10.7.5

There is a Studio One update available but I get a failure message after attempting to download it.  This problem only appeared within the last week or so.

Answer 1

You may need to fully remove any previously installed device drivers.

http://support.presonus.com/entries/113168-firestudio-how-do-i-uninstall-reinstall-my-firestudio-drivers-on-a-mac-computer

Then download these.

https://pae-web.presonusmusic.com/downloads/products/dmg/PreSonus_Universal_Control_172.dmg

You may also try to install and connect your FireStudio to another computer to determine if it will work.  Rule out hardware fault or bad cable.