Alternative Install Method worked for Me
Download the Glasstheme zip, extract, copy out the SystemUI.apk and place it on your SD Card. On your Gtab, copy your original SystemUI.apk (from the System/App folder) and save it on your SD card as a backup in a different directory. Then go back and copy your extracted SystemUI.apk and paste into the original System/App location; You will get force closes, but then just Hit Power and Reboot.
On reboot, your new theme is applied.
This way you can restore your original SystemUI.apk at any time.
Thanks to ssaass for creating it!