Edit a scanned PDF doc

"DC" is a version, not an app. This may be what's throwing you. There is Acrobat Pro DC, a subscription, and Acrobat Reader DC, free. If you want to edit you need TWO things

1. Subscribe to Acrobat Pro DC 

AND

2. Stop using Acrobat Reader DC, use Acrobat Pro DC instead.

Nothing will change Acrobat Reader to let it let. This is especially confusing because SOME of the add ons DO change Reader. But not this one.

Hi Default,

No, that shouldn't be required, Acrobat Reader (the correct name) and Acrobat Standard or Acrobat Pro (Acrobat is not available for Macs but Acrobat Pro is avialable for Macs and PCs) can live side by side with no issue.

Now, back to your document:

—How did you scan the document? (What kind of scanner did you use? Did you take a photo of the document? Did someone else scan this and send it to you? If so, how did they scan the document?)

—What format did you scan to? (What is the suffix of the document: JPG, TIF, PDF, what?)

—How are you trying to edit? (Are you just opening up the document and trying to edit? Are you going to the Edit Tool withing Acrobat Pro? What are you doing?)

—And lastly, what is your OS (and what release)?

Sorry for all the questions but to give you a good answer, I/we need the information above. 

Thanks!