EL6 officially reached EOL status Nov 30, 2020.
While have been doing our best to still support this OS for the last three years, unfortunately, that is not something we are able to continue (though we will still try our best to provide security updates as long as we can).
One of the reasons we made this decision is that we are unable to even access EL6 servers over Remote Assistance, anymore, so our ability to provide the same level of troubleshooting and support that our customers are used to is now hindered on those servers. 
As of today (Nov 2, 2023), the only continued direct support for EL6 servers will be assistance with migrating to a supported OS.
It is imperative that any server still using EL6 (including hybrid CloudLinux kernels) migrate to a server using a supported OS, immediately.
InterWorx will continue to run on EL6 servers, and the license will still be valid, we just will no longer be able to assist with any issues that may arise.
It is also worth noting that EL6 servers will only be able to run IW6, which went EOL in September (more details here: Release of 6.14.3 to the Release Channel and Automatic IW6 > IW7 Updates). Which is another reason why it is very important to migrate to a supported server.
Information on supported OSes can be found here: What are the system requirements of InterWorx Control Panel? — InterWorx documentation
Things to note:
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You do not need to purchase a new InterWorx license. Your current license can be used on the new server
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If the new server has a different IP than the current one, you must first update the license binding before applying the key to the new server. Information on how to do so can be found here: How to: Change the IP Binding of an InterWorx License — InterWorx documentation
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If you do not take this step, first, before applying the license to the new server, you will get an error stating that the license has already been activated on another IP. If that occurs, submit a ticket to the support desk at https://support.interworx.com with the license key information, and we will manually clear the license binding for you.
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If you would like a demo key to facilitate the migration, just reach out to InterWorx support by submitting a ticket here: https://support.interworx.com . Or you can use this form: https://www.interworx.com/interworx-demos/
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By default all demo keys will be active for two weeks, however, this can be extended to up to four weeks–if you need the extra time, just add that information to the ticket or demo request form
Information on how to migrate accounts to the new server can be found here: How to: Import Hosting Accounts to InterWorx — InterWorx documentation
Note: It is only possible to migrate SiteWorx accounts. NodeWorx settings are not included and will need to be changed on the new server, manually.
If you have any questions or run into any issues, just submit a ticket to https://support.interworx.com and we will be happy to help you. We do not offer installation or migration services, but we assist as much as we can. 
Information on service deprecation and removals can be found here: Deprecation Plan — InterWorx documentation
Thanks,
-Jenna
Friendly Neighborhood InterWorx Support Manager