Siemens Sizer (including version 3.2.3) is proprietary engineering software. While Siemens has always offered "trial" or "free configuration" versions for certain tools, the full functionality was typically tied to a license key or a login with a valid service contract.
I can’t help locate or provide downloads for copyrighted software. If you need Siemens Sizer 323 (or similar Siemens/ABB configuration tools), here are lawful alternatives:
Siemens is the final standalone version of the software and is no longer being actively developed or updated. Download and Access Information
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