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While removal of the software is suggested, it is not in fact actually
required.

WinZip 8.1 -only- will accept the /quninstall switch when executed from
the command line, which will remove the software without further action;
prior releases accept only the /uninstall switch, which does produce a
confirmation dialog.

While there's no option for installing the WinZip Command Line Support
Add-On in an unattended operation, please note that installation is not
actually required. You can simply open the WZCLINE installation file
using WinZip, extract the contents, then copy the extracted files to the
WinZip program folder, typically, C:\program files\winzip. The add on
is recognized as registered when placed with a registered copy of WinZip
itself.

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copy to HKLM.. not default

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Quote:

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Any changes that a particular user makes in WinZip's configuration will be stored only in the HKCU key. When a person who has not previously used WinZip on this machine (i.e., the WinZip HKCU does not exist) runs WinZip for the first time, WinZip will silently copy the HKLM key into that user's HKCU. Previous versions of WinZip would have activated WinZip's install wizard in this situation. This new feature should make most uses of AUTOINST.TXT (described below) unnecessary.

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So it seems fixed in version 9