Can I produce a chm file from Styler? How do I do this?
Yes, but you will have to make sure you have the Microsoft HTML Help Workshop software configured on your system before it will be available. You can find it here: https://www.microsoft.com/en-us/download/details.aspx?id=21138
HTML Help Workshop is pretty old software, so it sometimes has trouble configuring itself in current versions of Windows. After installing it, you should see a menu option File->Publish->For HTML Help in Arbortext Styler. If that option is disabled, it means Arbortext can't "see" your Help Workshop installation.
To fix it, you can force the association of *.hhp files with Help Workshop:
There are some tips for things like graphic handling, etc. in the Arbortext Help Center. See https://support.ptc.com/help/arbortext_hc/ae71_hc/en/#page/editor%2Feditor_help%2Fhelp5042.html%23
--Clay