Yes, after 30 days it does not expire, however you will notice a slight delay on startup at the nag screen, the longer you use FlashFXP the longer the delay will become. 
 
I highly recommend that you do not edit any registry settings or  flashfxp.ini directly, modifying a value incorrectly can cause unpredictable results, including being unable to open FlashFXP. 
 
You might want to check for an errorlog.txt in the FlashFXP folder.
		 
		
		
		
		
		
		
		
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