Hi there,
If you downloaded the version 26.10 and installed it successfully, your Kutools should be upgrated. If it did not, please try to uninstall Kutools for Excel from your computer and then download and install 26.10,
If there are any further questions, please don't hesitate to ask me.
About the Special Filter, please try it again after you install 26.10. If it's still not working, please check the language and excel version you are using. And check if they are the same as your colleague's?
Amanda