Having issues updating Palo Alto Networks app for Splunk

Hi,

I'm trying to update the Palo Alto App for Splunk but seems like it does not work:

# ./splunk install app /home/balbano/SplunkforPaloAltoNetworks.zip -update 1
Splunk username: $user
Password:

An error occurred:
file could not be opened successfully

Based on my reading looks like Splunk does not like ZIP files.

If that is the case how do I update to the new Palo Alto App?

Any help would be great.

Thanks. Brian