Install Lexia via GP

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Hi,

I need to install Lexia on a lot of PCs and I've seen that there are two MSI files on their site, the updater and the fresh installer.

I know how to customise the msi and create the GP but....

 

Does anyone have a script to check for which installer is needed? A few of the PCs already have an older version installed and need the updater, but most will need the full install

 

Thanks,