Hi @dflatley, To troubleshoot further we'll need logs from msiexec.exe.  You can generate them by doing something like the following from a command prompt: msiexec /l*vx msiexec.log /i <splunk.msi> (Where <splunk.msi> is replaced with the filename of the MSI.) If you then search msiexec.log for the string return value 3  and paste 20 or so lines immediately preceding it, hopefully that will tell us what has gone wrong. There may also be a file in %TEMP% called splunk.log.  That may also help shed some light. Cheers,    - Jo.     ... View more