Upgrading Py2exe App

[T]

I have a Python app which I converted to an EXE (all files separate;
single EXE didn't work properly) via py2exe - I plan on distributing
this and would like the ability to remotely upgrade the program (for
example, via HTTP/HTTPS).   Looks like it's not just the EXE that I
will need need to replace (DLLs, the library.zip, etc.).  What would
be the best way to go about doing this?