Hi,
I think you have forgot the quiet flag, look at this example:
msiexec.exe /i splunkuniversalforwarder_x86.msi RECEIVING_INDEXER="indexer1:9997" WINEVENTLOG_SEC_ENABLE=1 WINEVENTLOG_SYS_ENABLE=1 AGREETOLICENSE=Yes /quiet
The quiet flag will enable an unattended installation of the MSI package.
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