# 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?

**URL:** <https://community.wowza.com/t/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/52541>\
**Category:** Wowza Streaming Engine\
**Created:** [December 24, 2018, 2:52pm UTC](https://community.wowza.com/t/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/52541 "2018-12-24T14:52:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ok\_mahe](https://avatars.discourse-cdn.com/v4/letter/o/8e7dd6/32.png) [@ok\_mahe](https://community.wowza.com/u/ok_mahe)\
**Post date:** [December 24, 2018, 2:52pm UTC](https://community.wowza.com/t/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/52541/1 "2018-12-24T14:52:32Z")

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Missing title. Missing body.

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**Author:** ![Alex\_C](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@Alex\_C](https://community.wowza.com/u/Alex_C)\
**Post date:** [December 28, 2018, 12:16am UTC](https://community.wowza.com/t/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/52541/2 "2018-12-28T00:16:10Z")

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

Hope this helps.

Regards,

Alex