OK, then the pop-up is not for updating the TouchGFX installation; it is only for updating projects. You will get this pop-up when e.g. you open a project that is currently version 4.25.0 in version 4.26.0. As stated in the referred doc: "Simply open your newly installed version of TouchGFX Designer and try to open your older application either through recent applications or the Open dialog. You will be greeted with the following popup:".
When you press "Yes", the project will be updated to version 4.26.0. After completing this, follow the procedure below:
- Open STM32CubeMX and generate code.
- Remove all TouchGFX-generated files.
- Generate code in TouchGFX Designer.
Just to clarify; to get TouchGFX 4.26.0, you need to download it from one of the following links:
https://www.st.com/en/embedded-software/x-cube-touchgfx.html
https://www.st.com/en/development-tools/touchgfxdesigner.html
If you have a user account, you can log in. Then you can see 4.26.0 under "All versions". If you download it as guest, you currently need to press "Get latest".
Best regards,
Johan