We do not have a download file for the latest version (19.1.0.320), but you can try downloading it from the developer's site
Download version 15.1.2.100 from Software Informer
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The file is clean, see the report.
Version: 15.1.2.100 (x86/x64)
Date update: Jun 28, 2018
File name: retrospect_15_1_2_100.zip
Size: 228 MB