Plextor PX-716SA manual cant be opened

Downloaded English manual for PX-716SA http://www.plextor.com/english/support/manuals/manuals.html.

French
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PX-716UF - IEEE 1394 FireWire and Hi-Speed USB 2.0 PX-716A (Atapi) PX-716A /SA(Atapi and Serial ATA) PX-716AL(Slot Loading Drive)

English

Tried to open with Winzip but got error - ‘Cannot open file: it does not appear to be a valid archive. If you downloaded this file, try downloading the file again.’ Error keeps repeating. How can this be fixed?

It worked using Powerarchiver. Try downloading the file again.

Download from direct link

http://www.plextor.com/english/support/manuals/px-716a-sa-manual-8-color.zip

Thanks for your help. Was able to open file.