Nitro Pro tab has disappeared from Outlook ribbon

[chart reader 0]

I am using Nitro Pro 9.0.3.2. Today when I clicked "Create PDF" on my Outlook ribbon to save a specified email as a PDF in a designated folder on my computer, it did not work. I returned to Outlook to try and repeat the process but the Nitro Pro tab had disappeared from the Outlook ribbon!! Absolutely no idea what happened here. I have created PDF of many emails in Outlook and never had a problem. Any idea how to fix this. I would greatly appreciate any help you can offer. Thank you. 

[AllainU 0]

Hello @chart reader,

Thank you for reaching out to us through our Community Forums!

I sent you a PM to address your concern.

Cheers!