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MT5 is not recognizing the product i got already. It sayd I have to buy it, however It was working 100%

Hi Huys I have the library for WFA and till days ago it was working perfect. At the momento I got a this message : WARNING: To use the features of the WalkForwardOptimizer MT5 library, it must be contracted on the MQL5.com website I already uninstall and install again the MT5, I used another PC (