Here’s why:

is a legacy version of Siemens' central engineering software used to program, simulate, and test LOGO! logic modules. While newer versions like LOGO! Soft Comfort V8.4 and V9 are currently standard, V6.1 was notably compatible with older operating systems such as Windows XP, Vista, and early versions of Linux and Mac OS X. Key Software Details

If you are unable to download LOGO Soft Comfort V6.1 from the Siemens website, you can try the following alternative sources:

: Extract the ZIP file and run the setup for your operating system (Windows 64-bit is standard).

Version 6.1 was released several years ago to support LOGO! 0BA7 and 0BA6 series. Key features included: