PDFCreator is already installed

Good afternoon,

Below is an install log.  The installer gets stuck at "PDFCreator is already installed", even though I used the /FORCEINSTALL and /SUPPRESSMSGBOXES options.  How can I do a silent upgrade?

Thank you,



2012-04-03 13:57:29.561   Log opened. (Time zone: UTC-07:00)

2012-04-03 13:57:29.561   Setup version: Inno Setup version 5.4.3 (a)
2012-04-03 13:57:29.561   Original Setup EXE: C:\\Windows\\system32\\PDFCreator-1_3_2_setup.exe
2012-04-03 13:57:29.561   Setup command line: /SL5="$300BA,17324941,54272,C:\\Windows\\system32\\PDFCreator-1_3_2_setup.exe" /FORCEINSTALL /LOADINF=\\\\server\\pdfcreator\\pdfcreator-132.inf /LOG=\\\\server\\logs\\pdfcreator-client-install-log.txt /SILENT /SUPPRESSMSGBOXES
2012-04-03 13:57:29.561   Windows version: 6.1.7601 SP1  (NT platform: Yes)
2012-04-03 13:57:29.561   64-bit Windows: No
2012-04-03 13:57:29.561   Processor architecture: x86
2012-04-03 13:57:29.561   User privileges: Administrative
2012-04-03 13:57:29.561   64-bit install mode: No
2012-04-03 13:57:29.576   Created temporary directory: C:\\Users\\ADMINI~1\\AppData\\Local\\Temp\\is-LALRV.tmp
2012-04-03 13:57:31.715   Message box (Yes/No):
                          PDFCreator is already installed. It is necessary to uninstall the existing installation [version 1.2.3] before installing this version [version 1.3.2].
                          Should the existing version [version 1.2.3] uninstall now?

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