Here's the original demo, packaged in much the same way as the GOG release, using DOSBOX for compatibility with modern systems (file size: 3MB):

Link

Packaged and tested under Windows 7, 64bit.

Disclaimer: The only thing I own here is the launcher application (which I hereby place in the public domain), everything else is copyrighted by their respective owners, namely Team17 for the demo and artwork, the DOSBOX team for the DOSBOX emulator and RARLABS for the WinRAR installer module.