Resolved! I had to delete the AppData folder where the MT4 platform was installed and reinstall the new folder. Thank you

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Can someone help me please?
After buying an EA on the MQL5 market, and having conveniently found it within my MT4 platform, from that moment I can no longer connect with the MQL5 market.
I can no longer download the programs and test them. I reinstalled the platform, checked the antivirus and firewall but nothing happened.
Any suggestions are welcome.
Thank you