Nitro Pro 13 Not Opening

[Brian Carter]

Hello.  When I go to open a file in Nitro, Nitro will not open.  Sometimes it will open but only allow 1 document to open.  If I open a second document, it will freeze and then I have to shut it down.  I just downloaded the new version of 13.19.  I cant open Nitro to get the rest of the numbers.  This download did not correct the issue.  Nitro was working fine yesterday.  Please help.

[Allain Umailin]

Hello @Brian Carter,

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

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

But if you have Windows 10, you can run the repair of Nitro Pro by clicking Windows button > Settings App. You may refer to this article for more details: https://www.howtogeek.com/369090/how-to-uninstall-or-repair-a-program-in-windows-10/ 

If repairing didn't help, please try 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. 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/ 

2. Download and run our Clean Up utility to uninstall your Nitro Pro:  http://install.nitropdf.com/professional_13220414/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. 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 13.22 using below offline installers:

x32 http://install.nitropdf.com/professional_13220414/en/retail/nitro_pro13_ba_x86.msi
x64 http://install.nitropdf.com/professional_13220414/en/retail/nitro_pro13_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.