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Nitro Pro stopped working: Bad parameter, cannot open files created with Nitro Pro


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Today, Apr 30, Nitro Pro version stopped working. Windows 10 Pro, 64-bit, 32GB Ram.

  • cannot open files created with Nitro Pro (in either Acrobat or Nitro), see error message/s
  • all tools return error "Bad parameter"
  • check for updates says software is up to date
  • no "repair" option per Nitro knowledge base
  • Nitro reports wrong Windows version

Link to PDF of screenshots

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I tried again this morning without downloading and reinstalling, and now it's working. I've seen a number of references in this forum that "... this happened both times on the night of the last day of the month" and yesterday (when it didn't work) was the last day of April. If I invest time to download, uninstall and reinstall your product are you saying it will fix this issue?

(BTW, thanks for the quick reply)

Edited by Ilo
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  • Official Nitronaut
Kelvin B. Villarin

Hi @Ilo,

You are most welcome.

I'm glad it's now working! A lot of improvements were implemented. Feel free to visit our release notes for the detailed enhancements (Version is the latest build): 


I suggest updating your copy to take advantage of these improvements.


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