Do a System Restore back to before you tried to update it. Then first uninstall before installing the latest version.
Ive been trying to run the Gigabyte App Center to fix some issues on my PC but i ran into an issue where i had 2 separate instillations of the program when i tried to install the latest version, Instead of updating it gave me 2 seperate programs, and by deleting one the other is stuck and it cant be uninstalled because it says it doesnt exist. Along with this when i try to reinstall the program it gives me the options to repair or uninstall, and neither do anything. Any ideas on how to fix an issue like this?