Product
With December 2018 release of Acrobat, converting XPS files to PDFs is disabled. If you try to convert an XPS file to PDF using Acrobat, you see a message saying that it’s an unsupported file type.
Impacted versions
|  | Version | 
|---|---|
| Acrobat | 19.010.20064 | 
| Acrobat 2017 | 17.011.30110 | 
| Acrobat 2015 Classic | 15.006.30461 | 
If you still want to enable the ability to convert XPS files to PDFs, create a registry key (Windows) as mentioned below.
Solution: Create a feature-specific registry key on Windows
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Quit Acrobat application if it's already running. 
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Open the registry editor - go to Run (Windows menu + R), type regedit.exe in the Open field and click OK. 
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In the registry editor, based on your installed version of the product, go the version-specific location listed below, and create the key FeatureState at the location; the key may not be present by default. For Acrobat (Continuous): - Location: HKEY_LOCAL_MACHINE\SOFTWARE\(Wow6432Node)\Adobe\Adobe Acrobat\DC\FeatureState
 For Acrobat (Classic - Acrobat 2017): - Location: HKEY_LOCAL_MACHINE\SOFTWARE\(Wow6432Node)\Adobe\Adobe Acrobat\2017\FeatureState
 For Acrobat (Classic - Acrobat 2015): - Location: HKEY_LOCAL_MACHINE\SOFTWARE\(Wow6432Node)\Adobe\Adobe Acrobat\2015\FeatureState
 
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Under FeatureState, create a key of type DWORD and name it BlockXPSParsing. Change its value to 0 (zero). NoteWhen the value of BlockXPSParsing is: - 0: Conversion of XPS to PDF is enabled in Acrobat
- 1: Conversion of XPS to PDF is disabled in Acrobat
 
 
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Close the registry editor.