Please save the download to your hard disk, extract it from there (if it is a ZIP file) and run it.
Download the four-week trial version of TNM 7 Second Edition, Build 10c (released March 29, 2020). This is a special pre-installed and pre-configured version which contains DOSBOX. Size: 16MB
TNM 7 SE Build 10c For DOSBOX wraps the latest TNM 7 SE binaries in the DOS emulator DOSBOX.
It is now possible again to run Windows-based plugins.