Hi, thank's for you answer.
I try this option, but it's not running like I need.
Splunk pdfserver is running till V6.0.1, and after 😞
So, i found an other solution, build another splunk server with a 5.0.18 install, reinstall pdfserver, and import my data with restAPI from my main cluster.
Then, I will leave this Splunk 5 server running alone, I would be able to upgrade my main cluster like I want with no problem with pdf printing.