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You need to change a Registry key to get it to work properly.
This is a long thread on the subject. Towards the end it explains how to change the Registry key that will fix the error you are having: https://community.amd.com/message/2850769?q=radeon%20settings
This is from above thread with the fix from a User:
135. Re: Radeon settings version and Driver version do not match. Please try again after updating to latest version(s).
So mine has finally worked,as someone suggested it was a registry error.
All you have to do is go to regedit.exe , then go to this key [HKEY_LOCAL_MACHINE\SOFTWARE\AMD\CN] and you will find DriverVersion.
Now all you have to do is remove whatever the value data is inside and make it blank.Then open task manager and close all AMD related service and then turn on RadeonSettings.It will work like a charm