"I test the free version of your slider maker and really like it, I plan to buy a licence. I have a question here, what should I do if the resister key not work?"
This may occur due to the misinput. Please try to:
(1) Make sure you use the correct register key.
(2) Copy and paste the key for avoiding typo. And delete any leading and trailing whitespace.
(3) If it still pops up the invalid message, maybe you can send us a screenshot about your trouble of "Invalid License Key".
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