VCL Ribbon Controls is subject to the Embarcadero Software License and Support
Agreement provided with your licensed copy of RAD Studio, Delphi or C++Builder.

If you create an application that uses the Ribbon Controls components, you must have
previously been granted a license for the Office UI (also referred to as "Fluent
UI") from Microsoft before you can deploy your application. You may not use the
Ribbon Control components if you do not have a valid license for the Office UI from
Microsoft. You receive no rights to the Office UI from Embarcadero.

A Tale of the Fluent UI (or Office UI)
Let me start from the beginning, while trying to keep the story short. The Ribbon VCL controls offer an implementation, natively done in the VCL with no external dependencies, of Microsoft Fluent UI (also know as Office UI). Given Microsoft has a patent on this UI (debatable, I know) using the controls required to accept a license from Microsoft, originally available at https://msdn.microsoft.com/en-us/office/aa973809.aspx. In the past RAD Studio installation alerted that accepting that license was required for legally using the controls.

Later on, Microsoft built an actual SDK (in Windows 7 and above, also back ported to Vista) to support building applications with the Fluent UI. So far so good. Afterwards, they retired the original license. Any developer who had already accepted Microsoft Fluent UI license can still build a clone UI, but developers cannot obtain that license any more. You can see this reported, among others, in Wikipedia at https://en.wikipedia.org/wiki/Ribbon_(computing):

The Microsoft Ribbon Licensing Page has been retired, therefore it is no longer possible to license the ribbon control from Microsoft.

This is why we had to pull the Ribbon VCL controls from the core RAD Studio product, as we have no way to grant all customers a license or indicate how to obtain one. This doesn't mean we are removing the controls completely. While we don't expect to have the Ribbon VCL controls as part of the product and covered by support, we are in the process of making the Ribbon controls available in the GetIt Package Manager, for any developer who has a valid license with Microsoft (something you have to determine yourself, of course). This was supposed soon after the 10.1 Berlin release, should be coming shortly.

Ribbon Future Options for RAD Studio Developers
Overall, though, this change of direction from Microsoft (which actually happens a few years back), requires rethinking the use of these controls. I'd offer 3 alternatives:

If you have a license and want maximum compatibility with existing code, you can keep using the existing Ribbon controls. Shortly we'll make the official package available on GetIt. We are also assessing how to keep fixing bugs and updating this library over time. This might involve the community.
You can switch to using an implementation of the Ribbon SDK from Microsoft. One set of VCL controls wrapping that implementation and called Ribbon Framework is available in the https://github.com/TurboPack/RibbonFramework library and it is already hosted in GetIt (and was hosted also for 10 Seattle). This has no legal limitations, and the team might also need help to keep this project moving. And thanks to Joachim Marder and the team behind these controls
You can consider moving away from the Ribbon UI. But this is more of a UI discussion I don't really want to focus on in this blog post.
As it should be clear from reading this blog post, it was never our intention to stop supporting the VCL Ribbon controls, but we don't have a way to do this legally for all of our customers. I know other component vendors have different interpretations of the legal status, but we did check with several sources (including directly with Microsoft) and we are convinced that there isn't another option. Once the VCL Ribbon controls will be made available in GetIt, consult with your legal counsel about using them.

Only for V.I.P