Use package control to install markdown preview. Restart st3.

List packages: markdown preview is shown. Markdown preferences can be opened.

Attempt to run markdown preview–none of the commands appear in the command palette.

Lots problems with packages in st3.

I don’t know about the specific package you mention but many plugins have not been updated to be compatible with ST3. (ST3 uses Python 3, rather than Python 2, and there were changes to its API as well.)

github.com/wbond/sublime_packag … e-Packages

Hope this helps,
Alex

Does st3 embed its own Python 3 interpreter? I have 2.7.3 installed on my machine.

I think ST comes with its own Python for all 3 OSs, but I can’t find a reference.