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Failed Conversion from Outlook

Derek Woo

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Nitro Pro 13 does not convert emails and/or attachments using the Outlook add-in.

Continually receive "Failed Conversion" dialogue when attempting to use Nitro Pro functions from Outlook ribbon.

Have read and tried all the posted suggestions to resolve; typical of the posts is:


Attempts at resolving include:

  • Have recently upgraded to Nitro Pro ( x64
  • uninstalled / reinstalled Nitro Pro 13
  • removed / replaced Nitro PDF Creator
  • deleted content and folders for Appdata and Program Files
  • installed latest Windows updates

Appreciate any advice on:

  1. How to fix Outlook add-in to get Create PDF to work correctly;
  2. How to check for product updates for Nitro Pro 13.


Many thanks all.

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  • 3 months later...
  • Official Nitronaut
Allain Umailin

Hello @Derek Woo,

Thank you for reaching out to us through our Community Forums and our sincere apologies for the delay.

To check for updates for Nitro Pro 13, please visit this page from time to time: https://www.gonitro.com/nps/product-details/downloads

With regard to issue converting Outlook emails, let us try some troubleshooting by referring to these steps:

1. I recommend that you repair your MS Office. Please reboot your computer before and after running this repair to ensure that there are no ties to MS Office still active in the background. If Modify button is greyed-out, please refer to this screen-cast that will teach you on how to go to Control Panel > All Control Panel Items > Programs and Features and repair your Nitro Pro program or any application installed on your system: https://www.screencast.com/t/rvpUkq40c

2. Clear the content of the directory under C:\users\your_username\Appdata\local\temp. For whatever reason, not all temp files automatically remove themselves and is NOT usually caused by Nitro Pro files. Kindly note Appdata folder is hidden and to unhide it, please refer to this article https://cybertext.wordpress.com/2012/05/29/cant-see-the-appdata-folder/ 

3. Download and run our Clean Up utility to uninstall your Nitro Pro:  http://install.nitropdf.com/professional_13310605/install-cleanup/install-cleanup.zip

NOTE: This clean-up tool will erase any existing signature files within Nitro so please save them to another location before using the clean-up tool in order to keep them. Please see this link for backing up custom stamps/signatures: https://kb.gonitro.com/knowledgebase#/search/stamps/000004307 

4. Clear all your downloads folder or delete all downloaded Nitro installers. This step is important because we noticed that if you are saving all the installers and you download them in the same folder (like the downloads folder), the EXE can pick up any MSI installer in that folder and you may pick-up one of the older builds instead of the newly downloaded package.

5. Download and install Nitro Pro 13.31 using below offline installers:

x32 http://install.nitropdf.com/professional_13310605/en/retail/nitro_pro13_ba_x86.msi 
x64 http://install.nitropdf.com/professional_13310605/en/retail/nitro_pro13_ba_x64.msi

To know if you have 32-bit or 64-bit, please refer to this article:

6. After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activate by entering your serial number.

Thank you for choosing Nitro and I hope this helps.


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