If you use the installer version of EmEditor, you can first install EmEditor v25.1.4 with the ChatAI plugin. Then, select “Check for Updates” from the Help menu in EmEditor and check the “Include preview versions” option. This will update both EmEditor and the ChatAI plugin.
If you need the portable version, you can download the ChatAI plugin v25.1.903 at:
https://download.emeditor.info/chatai/chatai64_25.1.903_portable.zip
Note that you will also need to download and install EmEditor v25.1.903 from https://support.emeditor.com/en/downloads.