when installing wowza streaming engine v 4.7.7. trial version the error like "Licence key is not valid for version 4" appears? how can i solve this problem?

Wowza Streaming Engine
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Hello @ok mahe,

It is best to contact our support team to resolve the licensing issues.

https://www.wowza.com/support/open-ticket

Generally speaking with that type of error message you should doublecheck the key you entered.

As detailed in the following support article:

https://www.wowza.com/docs/troubleshoot-wowza-streaming-engine-licensing-errors-at-startup

Hope this helps.

Regards,

Alex