Upgrading to the current version of WinZip from an earlier one is not free. Registration codes from one major version of WinZip cannot be to register another major version of WinZip. For example, if you have WinZip 17 registration information, you can install and register WinZip 17.0 or WinZip 17.5, but your information will not work in WinZip 18. If you install the current version of WinZip over an older, existing, registered copy of WinZip; the result will be an evaluation version of WinZip. Please check both the WinZip version that you purchased and the WinZip version that is installed.
In order to obtain a registration code for the current version of WinZip, an upgrade must be purchased. Registered users of previous versions of WinZip are eligible to upgrade at 50% of the WinZip list price.
If you want to continue to use your existing licensed version of WinZip instead of upgrading, the install file for that earlier version may be downloaded from the Alternative Download Links page. The current version of WinZip may also be downloaded directly from the Download WinZip page. If you have lost your registration code, please see What is my registration code?
It will be necessary to uninstall the current version of WinZip prior to installing the older version. Once the older version has been installed, the registration code for that particular version may be entered. Keep in mind that WinZip 9.0 uses a registration number of 8 digits. WinZip 10 and later uses a registration code of 30 characters.
If you just purchased the current version of WinZip, please make sure that you also installed that version and make certain that you entered the correct registration information (the registration code will be 30 characters in length). You may also want to see How to register WinZip software with a registration code.
At times, a name or registration code mismatch may occur. If you entered your registration information correctly and you have the correct version of WinZip installed, but it will not register, please email the Service Department.