Could you run again the installation following the https://docs.paloaltonetworks.com/content/dam/techdocs/en_US/pdf/cortex/cortex-xdr/7-0/cortex-xdr-ag... page 9 to get installation logs?
msiexec /i c:\install\cortexxdr.msi /l*v C:\temp\cortexxdrinstall.log /qn
Please post the logs so we can have more context and help you out.
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