liteicon fix: DL latest version (which you have...)
Right-click to show the package content
Go to Contents, Resources and copy, paste and change the name from IconData_10.11.plist to IconData_10.12.plist. Open it and search and change all 10.11 to 10.12.
then, reboot into recovery, open terminal, disable sip (google this if you need to); make your changes, log out, log in. confirm your changes, then again boot into recovery, and re-enable SIP.