1. Uninstall XtendSAN via it's folder
Go > Applications > XtendSAN > XtendSAN Uninstall :: uninstaller:: [Button] - will bring up wizard
The XtendSAN installer will require a reboot to finish. You might have to click the Apple and reboot button. Then let the OS operate at its own pace.
When the Desktop comes back up perform a 2nd Enhanced Power Cycle as before (removing the power cable for 2 min)
See, how this will be as clean a slate as possible?
2. Install XtendSAN (remember to check for the Allow button)
Do a 2nd Reboot
and then perform a 3rd Enhanced Power Cycle wait another 2 minutes.
Note: refrain from opening the program until this 3rd Power Cycle completes. Finder will then have a program written to it. Verify in Security settings if the Allow button is visible. If yes, just click it and reboot.
You can now safely Open XtendSAN as a program. Verify it Opens when nothing is attached as we simply want to discover if there are issues prior to any Targets. If it Opens w/ no error messages this is a success. Continue the setup of your Network as normal (i.e. including attaching Targets) here.