[wpkg-users] Skype MSI Uninstall String

Marco schmidt at fgcz.ethz.ch
Thu Dec 11 16:06:27 CET 2014

We had the discussion about such a script already in October.
[wpkg-users] GetMSIProperties

Some remarks on your statements:
1. the "UninstallString" usually does not do a silent uninstall.
For "silent uninstall" the string has to be modified. Which makes it 
hard for a general solution.
But a special solution for msi is easy, depending on the scripting 
language (cmd.exe, powershell, vbscript, autoit, ...)
Don't forget that there are different registry trees for 32 and 64bit 
application uninstalls.

2. If you install skype (or any software) with wpkg, the "remove" part 
is stored in the wpkg database.
As long as only WPKG does install or upgrade software, there is no need 
to put all previous uninstall strings in the remove parts.

Isn't Skype Business moving to replace "Microsoft Lync"?
I guess there will soon be some major changes in the Skype-Business 

Greetings ...

On 11.12.2014 15:04, Carlos R. Pasqualini wrote:
> Hi list!
> I'm having issues with the Skype upgrade, in particular MSI error 1638
> See: http://wpkg.org/Skype#Skype_-_Business_Version_.28MSI_installer.29
> WPKG is searching for it on the registry uninstall, determining the
> DisplayVersion when comparing for check uninstall
> Indeed, the command that i need to execute is the command enclosed in
> the Registry Key 'UninstallString' of the previously installed package
> The question is:
> Is there a way to obtain the installed version's product code, or to
> execute the command included in 'UninstallString'?
> Nowadays i have one remove command for each product code i knew of for
> Skype previous versions, but i think this is not an ideal solution, it's
> just an ugly hack.
> Thanks!
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