You can use the trial version of PowerZip without the Product Key for up to 45 days (from the date your first installed PowerZip on your computer). Simply click "Buy Later" on the start-up screen. The Buy Later button will become disabled once the 45-day trial period has elapsed.

You will receive your Product Key when / if you purchase PowerZip.

Simply uninstall PowerZip via the Add/Remove Programs applet in the Control Panel.

To download PowerZip, please click here.

This is due to a problem with your web browser configuration. The symbol / logo is for QuickTime, a movie-viewer product by Apple Computer, Inc.

It seems that sometimes QuickTime incorrectly configures your web browser and interferes with downloading (not just of PowerZip but downloading of executable files in general).

For information about how to fix this problem, please see Microsoft Knowledge Base Article 312455.

PowerZip Product Key is a 2-line alphanumeric code that unlocks the trial version of PowerZip. When you purchase PowerZip, you will receive your Product Key by e-mail.

Please click here to obtain a new copy of your Product Key.

Please follow the instructions in the Product Key e-mail to enter the Product Key into PowerZip.

The Product Key is too long to be typed in manually. No matter how careful you are or how many times you check it, it's very easy to make a typo, like a Z instead of a 2 or to swap two letters around. Please don't type in the Product Key. Instead, please follow the instructions in your Product Key e-mail to copy and paste the Product Key.

1. Please make sure that the Compression Level option is set to Normal or Maximum in the Options step of the Compression Wizard.

2. Some file formats (e.g. JPEG, GIF, MP3, PDF) have built-in compression. The JPEG format, for example, already contains the image data in a compressed form. You can't compress that data much further (no matter what compression program or algorithm you use). Hence, trying to compress such files yields only a small reduction in size because there is a limit to how much data can be compressed. Other types of files (such as text files, Word documents, programs, web pages, spreadsheets etc.) compress well and in many cases you can get a compression ratio in excess of 90%. Even with the file types that don't compress well, it might still be more convenient to use PowerZip to zip several such files into one zip file (to use as an e-mail attachment, for instance).

All Zip programs use the same compression algorithm (deflate) so there is very little difference in the compression ratio between different Zip programs.

This is due to a new "security feature" in Microsoft Outlook Express 6.0 SP1. For more information (including how to turn it off), please see please see Microsoft Knowledge Base Article 329570.

Yes, PowerZip is fully compatible with Windows XP x64 Edition. PowerZip is able to integrate itself with Windows Explorer (add Zip / Unzip items to the right-click menu) under 64-bit Windows.

• Uninstall your existing version using the Add/Remove Programs applet in the Control Panel
• Go to the download page to download the latest version
• Run (double-click) the file you downloaded to install the new version
• Follow the instructions in your Product Key e-mail to enter your PowerZip Product Key

NOTE: If you no longer have the Product Key e-mail, please click here to obtain another copy.