PDF Compressor Desktop 2.1 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The software lies within System Utilities, more precisely Archivers. This software was originally created by CVision Technologies.
From the developer:
PDFCompressor Desktop provides a full range of document and image handling capabilities. With industry leading compression rates on both color and bitonal files, along with incredibly accurate OCR, PDFCompressor will serve well as an integral part in your document creation and organization processes. PDFCompressor users include: US Army, Xerox, FedEx, Intel, Disney, and JPMorgan Chase. Plus, there are many, many more features.
You may want to check out more software, such as LuraTech PDF Compressor Desktop, LuraDocument PDF Compressor Desktop or PDF Candy Desktop, which might be similar to PDF Compressor Desktop.