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Expert Advisor issue (invalid license)

I have bought an EA a couple of weeks ago, and have been backtesting it before go live, however yesterday it stopped working and I get the error message: "invalid license (508)" "Loading of Perfect Score MT5 failed" Could you help me? What should I do? In case a reinstall it, will this

4

Bought signal and by mistake I set up to my demo account

I just bought a signal and it is now operating on my demo account and not on my real account . As you see I am a noob, but I need to ask, can I change this setup to my real account? Or I need to pay again for the same signal