I had to make a couple of changes to the .\TS-windnsanalytical\bin\get_dns_analytics.path file to get everything to work:
$SPLUNK_HOME is not set on the deployment client, so need to explicitly add the full path to SplunkUniversalForwarder.
Also, the Download tarball expands to TA-windnsanalytical not TA-WindowsDNSAnalytical
Original get_dns_analytics.path file:
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -command "& '$SPLUNK_HOME\etc\apps\TA-WindowsDNSAnalytical\bin\get_dns_analytics.ps1'"
Working get_dns_analytics.path file:
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -command "& 'C:\Program Files\SplunkUniversalForwarder\etc\apps\TA-windnsanalytical\bin\get_dns_analytics.ps1'"
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