Searching for "Download PDFCompressor Pro5 rar" typically points toward third-party file-sharing sites or archives that may contain cracked software. I recommend exercising caution, as .rar files from unofficial sources frequently contain malware or bundled "PUPs" (Potentially Unwanted Programs).

: Open the PDF in Preview , go to File > Export , and select the Quartz Filter: Reduce File Size .

: Many "Print to PDF" drivers (like Microsoft Print to PDF) allow you to adjust quality settings to save space.