That is a weird file location. But try this.
Create two environment variables that name new folders where you know you have write permission. Point to the folders in the environment variables like this (using appropriate Mac names).
SPSS_CDIALOGS_PATH=c:\dlgs
SPSS_EXTENSIONS_PATH=C:\extcommon
Start or restart Statistics and try the install.
Consult a Mac person how to create environment variables if you don't know how to do that.
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