Problem saving the license key

Hello,

I can’t save the license key, I get an “Unknown error” message.
I bought “Filter Everything Pro” about 6 months ago and everything worked as it should, unfortunately, but the project was stopped for a long time, now I’m coming back to it and I encountered a problem, I can’t change anything in the settings because the error “Error” appears : you can not update settings because Filter Everything Pro plugin is locked. Please, enter your license key to unlock it.” entering the license key does nothing, the message “Unknown error.” appears.

I thought the key had expired, so I bought a new one yesterday, but it doesn’t solve the problem. I even made a new separate installation of WordPress – clean without any unnecessary plugins and the problem is the same.

Currently, the WordPress version is 6.4.3
PHP version 8.1

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