How can RxLib be used together with Delphi 11?

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Unfortunately, RxLib (also known as Rx Library) is not compatible with Delphi 11 or any newer Delphi versions since it is an open source library that was last updated in 2003 and only supports Delphi 6 to Delphi 7.

However, there are some alternatives to RxLib that you may want to consider such as:

1. JVCL - JEDI Visual Component Library
2. LMD Tools
3. TMS Component Pack
4. DevExpress VCL

These libraries offer similar functionalities to RxLib and are compatible with Delphi 11. You can download and install these libraries into your Delphi IDE and start using their components in your projects.

Note that migrating from RxLib to a new library may require some effort and changes in your existing codebase.