You can use Windows Compatibility Mode to run Windows 10 applications on Windows 11. Right-click the app, go to Properties > Compatibility, and select Windows 10 under Run this program in compatibility mode for.
For more robust solutions, consider setting up a Virtual Machine (VM) using Hyper-V (built into Windows 11 Pro) or VirtualBox, where you can install Windows 10 and run incompatible apps seamlessly.
Windows Sandbox (available in Pro and Enterprise editions) can run lightweight virtual environments.