Additional files need to be installed to create PDF from this file (Excel). You must have Administrator Privileges to install these files

[barclaywlamont]

Keep getting this message when combining files - exhausted Adobe help - they couldn't fix it! Adobe Pro Dc and Windows 10 Pro. Anyone clever enough to find a fix?

[barclaywlamont · Accepted solution]

Developer contact confirmed this is a commonplace problem. Adobe Bug #4134024 - no fix available for 'about a month'.

[ReneeLC]

I am also suffering from this bug. Is there a way we can track this bug or see whether it's been fixed?

[laurenj12570616]

Anything yet?  This is a very annoying bug!

[ReneeLC]

An update on my end - we also suffered from this problem. However, the root cause ended up being a too-strict security policy getting pushed out from our security team. When they rolled it back, Acrobat worked again.

Check your system events viewer.

[Brian_E__Morgan]

This issue appears to continue to exist (Continuous Release version 2019.012.20035). Seeing as there was supposed to be a release to fix this back in 2016 (based on the dates on the posts here), I guess everyone just gave up, or maybe some miracle happened that fixed everyone and no one mentioned it here.

I have been as far on the web as I can get with Google's help trying to fix this problem, including messing around with DCOM permissions. Does anyone have an actual fix for this, or is it just a failure I'm going to have to learn to live with?

[TennysonElec]

I spoke with Adobe support in June 2020 and it's still an unresolved known issue.  Are they actively working on the issue or hoping it will just go away?  Four years seems like a long time to be working to resolve something.

[defaultt50vot6wp3o3]

Don't know if this will be of any help to anybody, but I had a device that was throwing up this error only when trying to combine or convert .docx files. I found in the Registry that the (Default) value under the regkey HKEY_CLASSES_ROOT\.docx was set incorrectly. I changed this to Word.Document.12 (I'm not sure if this will vary depending on the version of Office installed) and Acrobat was able to successfully work with .docx files again.

Looks like the device had been upgraded at some point from Windows 7 to 10 and Office 2010 to 2016, so I'm guessing the reg value at some stage of the process.

Hopefully this post will be of use to somebody out there.

[johnathan1210]

I had this problem as well and I found a solution!

The problem actually lies in Microsoft Office, not Adobe. You need to run a repair tool for Microsoft Office.  This tool is already installed on your computer if you have Office. Here is the solution:

Go to: Settings > Apps > Click "Microsoft 365 Apps for enterprise - en - us" > Modify > Allow changes > Quick Repair

Hope this helps!

[Laurie-Ann28162199cx69]

Shoot.  This did not work for me.  I am still unable to convert excel & PP. Word works.  That's it.  Any other suggestions?

[Elaine292674366ycf]

This worked for me, or at least got me halfway there. The document opens now, but Adobe didn't recognize the form fields. After figuring out how to add form fields in Adobe, I got it imported into my D2L course! THX 

[Mehrdad237384811m7a]

Are you using the Portable version?
If so, you'll need to use an installable version because Adobe needs to access other applications (i.e ms word when combining .docx files to a pdf file).

In portable versions, permission is usually denied by Windows.

[Cris35579827z21q]

Old Issue but fix is to run Quick Repair on the Office installation