The D-Script and Global Script engines received performance optimizations. Loop executions were 15% faster compared to version 4.08, reducing screen lag on complex projects.

Disk 2. Soft_GPPROEX409600D2.iso. 1.48 GB (1,590,169,600 Byte) LanguagePack. [Language Pack] GP-Pro EX Version 4.09.600. Pro-face by Schneider Electric GP-Pro EX Ver. 4.09.600 Limited Edition (Disc 1 / Disc 2)

The string refers to Version 4.09.600 of GP-Pro EX. This was a significant maintenance release that rolled out in mid-to-late 2020 and remained highly relevant throughout 2021. It was not the absolute latest version (4.10.x existed), but it was widely regarded as the most stable and reliable build for production environments.

: A "Limited Edition" or trial version is often available for users to test the software's capabilities before purchasing a full license. Pro-face by Schneider Electric

Then, he found it. A post on an obscure German engineering board from February 2021. No text, just a magnet link and a cryptic signature: Der Zeitmesser (The Timekeeper).

: Official support for Pro-face Remote HMI on ET6000 HMIs.