If you are unable to find or install version 3.23, consider these modern alternatives from Siemens:
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Built-in mechanical templates speed up load calculations. If you are unable to find or install version 3
The latest version, Siemens Sizer 3.23, comes with a multitude of features that make electrical engineering design more efficient: Siemens Sizer 3.23
Siemens SIZER 3.23 is a comprehensive configuration software. It assists engineers in designing complete drive systems. The tool guides you from the mains supply down to the motor shaft. Core Functions