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Are Office Add-ins x64 Compatible?

John Gupton

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I am currently running Nitro Pro V12.16.3.574 on Win 10 Pro x64.  Nitro Pro add-ins have always run with MS Office 2010 (X86) that I have been running for a number of years.

Today I upgraded my Office product to Office 365 x64.  Though Nitro reports the add-ins are installed into the MS Office products, Office 365 reports a run-time error when loading them.

Does Nitro offer 64-bit compatible add-ins for x64 Office products?


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Allain Umailin

Hello @John_G,

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

When you upgraded from MS Office 2010 to Office 365, did you run a repair of your Nitro Pro 12?

If not yet, I recommend that you repair your Nitro Pro (via Start or Windows button > Control Panel > Programs and Features > Uninstall a Program if you have Windows 7, 8 or 8.1). Please reboot your computer before and after running this repair to ensure that there are no ties to Nitro still active in the background. You may refer to this article:   https://kb.gonitro.com/knowledgebase#/search/repair/000004603

Thank you for choosing Nitro and I hope this helps!

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Hello Allain,

I tried a number of things before my post.  That included performing the repair operation to Nitro Pro, rebooting, removing the add-ins through the Support Tools panel, re-adding the add-ins (with Office products closed).  Nothing seems to work.

I noticed that the office add-in, Nitro.OfficeAddin.Net.12.dll, only exists in the C:\Program Files (x86) folder; nothing in the C:\Program Files folder.  That seems to imply that the Office add-in is only 32-bit compatible.  However, if the Nitro development staff says otherwise, I will try a complete uninstall of Nitro, then re-install.  (BTW, I do have the x64 version of Nitro installed.)

Thanks.  I will await your reply.

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Allain Umailin

Hello @John_G,

Thank you for this information.

If you are going to uninstall and reinstall the whole program, I suggest following these steps:

1. 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.

2. Download and run our Clean Up utility to uninstall your Nitro Pro: http://install.nitropdf.com/professional_1382140/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 

3. Please 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.

4. Download and install Nitro Pro using below offline installers:

x32 http://install.nitropdf.com/professional_12163574/en/retail/nitro_pro12_ba_x86.msi 
x64 http://install.nitropdf.com/professional_12163574/en/retail/nitro_pro12_ba_x64.msi

If you are not sure which to pick, this will help: https://kb.gonitro.com/knowledgebase#/search/64/000003790 

5. 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 very much in advance and I am looking forward to hearing back from you.

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Hello Allain:

Well, the uninstall and fresh re-install is the secret for Nitro to install Office add-ins in the correct Progam Files folder.  Apparently the installer looks at the Office product versions during the install process.  A Repair operation won't do it.  Therefore, if a Nitro user decides to upgrade/update their MS Office to a different modality (x86, x64), they will also need to perform this uninstall/re-install operation of Nitro Pro.

Although the Nitro Pro add-ins were correctly registered in MS Word, Excel, Office, and PowerPoint when these product launch, I did have to go into each application's Options --> Add-ins, Manage COM Add-ins --> Go...  to check the Nitro Pro check box in order for the Nitro Pro add-in to load.  However, the settings "stuck" and Nitro Pro was loaded with each subsequent launch of Word, Excel, Outlook, and PowerPoint.  Not sure if this scenario will be true for every Nitro user, but keep this extra "step" in mind if they don't see Nitro Pro listed in the application Menu Bar.

BTW, I did not have to use the cleanup VB script file.  I first downloaded that tool in 2014 and used it a few times for stubborn Nitro problems.  "Cleanup" is very thorough as it gets rid of registry keys, too.  I do backup certain Nitro keys periodically - just in case; especially for an upgrade install of Nitro Pro.

I have at least one installer for every major version of Nitro Pro since V4.91.0.0 (June 2006). 50 at the last count - I have been using NP for a long time.  I already had the msi for  If using an msi, there shouldn't be much danger of a download exe installer to pick the wrong version.

Thank you for your time to assist me.


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