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I upgraded to Nitro Pro from Nitro 10 and everything worked fine.  I deleted the Nitro 10 from my computer and now Outlook says I have no pdf previewer installed.  All the outlook settings for pdf are correct.  I don't know if this is an Outlook problem or a Nitro problem but it only started happening after I deleted the Nitro 10.  Can I upload Nitro 10 again?

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  • Official Nitronaut

Hello Mercy,

Thanks for reaching out to us!

I would like you to try the following:

1. Run a repair on Nitro Pro. 
2. Re-register the DLL file using the following Administrator command (Admin CMD): 

For a 64-bit computer
regsvr32 -u "C:\Program Files\Nitro\Pro\13\NitroPDFPreviewHandler.dll" 
regsvr32 "C:\Program Files\Nitro\Pro\13\NitroPDFPreviewHandler.dll" 

Please let me know how that goes.

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