Here's the step by step way to update:
Repair Permissions using the Disk Utility on the drive to be updated;*
Backup your current installation using Carbon Copy Cloner or SuperDuper;
Download the latest MultiBeast for Mavericks which has the latest ACL8xy audio drivers;
Download the Combo Update and run the Combo Update to update to 10.9.5;
Re-boot;
Run MultiBeast for Mavericks and just select your audio driver to install and, optionally, the 10.9.4+ TRIM patch;
Re-boot; and
Repair Permissions again.*
If you have TRIM enabled, check to see if it was affected by this update.
* You can use the Terminal instead of Disk Utility if you feel comfortable with a UNIX command:
Code:
sudo diskutil repairPermissions /