Related search suggestions for further research (you can use these terms in a web search): ModSoft download, ModSoft 2.6 release notes, ModSoft plugin host system requirements.

Since Modsoft 2.6 is a 16-bit DOS application, it on modern 64-bit operating systems like Windows 10 or 11.

For a more stable industrial environment, use a Virtual Machine (VM) running Windows XP or a pure MS-DOS partition. Use software like VMware or Oracle VirtualBox.