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If you had the trial version installed before downloading the full (pay) version, you need to uninstall the free version first. It would be a good idea to run something like CCleaner before installing to get rid of any "leftovers".

Also remember to reboot after uninstalling and once again after reinstalling

This is actually true of pretty much every Stardock program, just in case there was something else you were thinking of getting.  CCleaner shouldn't be necessary, just a reboot after uninstalling both versions.

I downloaded the trial, It says first when i apply a skin "30 days remaining"  then as soon as that comes up it goes and another menu pops up saying "your trial has expired"?