Kepware does not offer a truly "free" full version. Instead, it provides a with the following characteristics:
V4.0 remains relevant for niche industrial applications due to its lightweight footprint and compatibility with obsolete operating systems. Kepserverex V4.0 Free Download
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. Kepware does not offer a truly "free" full version
It requires as little as 32 MB of RAM and a 200 MHz processor, making it ideal for older field PCs. After two hours, the runtime stops and must
PTC offers unlimited email support even for demo users, which is rare for legacy software. Technical Specifications for V4.0
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
V4.0 was optimized for Windows 98, NT 4.0 (SP5), and Windows 2000.