QB Issue Resolution:
Unload that DC version and download the acrobat reader and it should work.
Dc for document cloud is to new for QB 2013 which used acrobat reader ver 9 or higher
Resolution for Issue 'How do I open prior VAT returns when QB says that it is unable to locate PDF viewer and I already have Adobe Acrobat Reader DC?' available: Yes (Solved).
Source: Intuit Community forum.
How do I open prior VAT returns when QB says that it is unable to locate PDF viewer and I already have Adobe Acrobat Reader DC?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Adobe Acrobat
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!
Error Recovery for Adobe Acrobat [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.
Additional Support Options: