# Licenses and hot upgrades

**URL:** <https://community.wowza.com/t/licenses-and-hot-upgrades/92083>\
**Category:** Wowza Streaming Engine\
**Created:** [October 7, 2020, 12:13am UTC](https://community.wowza.com/t/licenses-and-hot-upgrades/92083 "2020-10-07T00:13:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Library\_IT](https://avatars.discourse-cdn.com/v4/letter/l/fbc32d/32.png) [@Library\_IT](https://community.wowza.com/u/Library_IT)\
**Post date:** [October 7, 2020, 12:13am UTC](https://community.wowza.com/t/licenses-and-hot-upgrades/92083/1 "2020-10-07T00:13:16Z")

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We’re in the process of upgrading from 4.6.0 running on a dedicated VM to 4.8.5 running in a Docker swarm (currently using a developer license). If possible, we’d like to do this with no downtime, by running both servers in parallel while we handle the switchover via DNS, and then taking down the old server once the DNS change has propagated.

Is it possible to do this with one Wowza Streaming Engine Monthly License, or is there no way around bringing the first server down before bringing the second one up?

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**Author:** ![Karel\_Boek](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/karel_boek/32/454_2.png) [@Karel\_Boek](https://community.wowza.com/u/Karel_Boek)\
**Post date:** [October 7, 2020, 4:21pm UTC](https://community.wowza.com/t/licenses-and-hot-upgrades/92083/2 "2020-10-07T16:21:02Z")

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If both your old and your new server are running at the same time, you’ll be billed for two licenses. There’s no technical way to avoid that. But you can explain your case to [customerservice@wowza.com](mailto:customerservice@wowza.com) and maybe they can help?

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**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\
**Post date:** [October 7, 2020, 7:40pm UTC](https://community.wowza.com/t/licenses-and-hot-upgrades/92083/3 "2020-10-07T19:40:28Z")

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This is correct info and great advice from Karel for you @Library_IT. If they don’t run concurrently for a long period of time we won’t charge you, but please do as suggested and reach out to customer service to discuss beforehand.

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**Author:** ![Library\_IT](https://avatars.discourse-cdn.com/v4/letter/l/fbc32d/32.png) [@Library\_IT](https://community.wowza.com/u/Library_IT)\
**Post date:** [October 15, 2020, 12:40am UTC](https://community.wowza.com/t/licenses-and-hot-upgrades/92083/4 "2020-10-15T00:40:45Z")

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@Rose_Power-Wowza_Com WIll do, thanks.