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

Hi @vengisa, You will need to have access to a Support Program: https://www.splunk.com/en_us/support-and-services/support-programs.html. If you do not, we may still be able to help you, but the problem is going to be getting access to the Procmon log I'm afraid. Cheers,    - Jo.   ... View more

Hi @vengisa, Drat!  I was hoping it would provide more context, but clearly it does not.  We're going to need a Procmon log to troubleshoot further, which will be very large in size, unfortunately.  Are you able to open a Support case with Splunk? Cheers,    - Jo.   ... View more

Hi @vengisa , Ah, that appears to be from the msiexec.exe log file.  What we want is the splunk.log file in the temp directory.  You should be able to find it by entering %TEMP% into the Explorer address bar.  Hopefully it will have more information on the _py_internal command. Cheers,    - Jo. ... View more

Hi @vengisa, There may be some further detail in %TEMP%\splunk.log.  Could you let us know what it says, please? Cheers,    - Jo. ... View more

Hi @sramiz , This warning is harmless.  It should be fixed in a future maintenance release of 8.1. Cheers,    - Jo. ... View more

Hi @Himanshu , Can you enable msiexec.exe logging like so: msiexec /l*vx msiexec.log /i splunk.msi And then once the installation has failed, search for "return value 3" in the log file, and what happened just prior to that is the problem. Please feel free to come back with a log snippet if it's not self-explanatory. Cheers,    - Jo.   ... View more