Some preview screenshots are available here.
The GNU/Linux version is available here (mirror).
The Windows 64-bit version can be downloaded here (mirror).
Windows 32-bit? If you have 32-bit Windows, copy the files in the ZIP attached to this post into the Windows 64-bit version's directory.
Changes since the last version:
Back from 'retirement' to implement two frequently requested features.
+ When editing PoP1 for DOS, a separate Map window can now be opened ("m"), that displays a movable and zoomable abstract representation of the entire level, which highlights related tiles when hovering over buttons, gates, exits left, loose tiles, etc.
+ PoP1 for DOS guard details can now be modified via the EXE screen (F2). This makes it easy to, for example, use guards with different amounts of hit points in the same level.
* Minor bug fixes.