We do not have a download file for the latest version (4.5), but you can try downloading it from the developer's site
Download version 4.0.1 from Software Informer
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The file is clean, see the report.
Version: 4.0.1 (x86)
Date update: Mar 22, 2012
File name: harmcalc_v4.0.1.zip
Size: 1.9 MB