Only other thing I can think is that you have to delete your whole Voltz mod folder in .techniclauncher. Again, make sure the temp folder in that folder is also empty just in case.
Before you delete the voltz folder, you should backup any single player worlds you have from the Saves folder in the Voltz folder so you can put them back later.
Delete the Voltz folder, then run the launcher. Go to options, select manual build selection and make sure the recommended build (currently 1.0.8) is selected in the dropdown box. Click ok, then try to log in using Voltz. It will redownload the whole mod from scratch. Run it and make sure it functions. Then close it and put your world backups back in place if needed.