V4.0 was optimized for Windows 98, NT 4.0 (SP5), and Windows 2000.

The server runs in two-hour increments. After two hours, the runtime stops and must be restarted, but there is no limit on how many times you can restart it.

V4.0 remains relevant for niche industrial applications due to its lightweight footprint and compatibility with obsolete operating systems.

While a direct "free download" for is no longer officially promoted by PTC (Kepware), users can still access the latest industrial connectivity platform as a free 2-hour demo . KEPServerEX Version 4.0 is a legacy product originally designed for older Windows environments and is now largely replaced by newer versions like Version 6 or the unified Kepware Server . Why Users Search for KEPServerEX V4.0

The demo typically includes all available drivers and advanced plug-ins, allowing for complete testing before purchase.