Prerequisite

for extensions 's support: xls, doc, ppt, xlsx, docx, pptx. It is necessary installed OPEN OFFICE on the application server that hosts your JIRA core instance

Automatic Installation

You can install PDF Editor for JIRA through the Universal Plugin Manager (UPM). For information on how to use UPM, take a look here.

Manual Installation

If you have the app file (a file with the extension .obr), 

1. Go to the Administration section of Jira and look for the Apps menu.
2. Select Upload App and upload thePDF Editor-X.X.X.obr file (where X.X.X is the PDF Editor version).