Aedict OCR is retired and no longer on Google Play. To read Japanese text off a photo or the screen, use Google Lens or Google Translate's camera: they recognize text for free. Copy the recognized text and paste it into Aedict's search box, or let Aedict Reader Popup analyze it from the clipboard.
A: Nope, this is a paid extension to the Aedict3 software, or rather, a standalone application, that performs the Optical Character Recognition and uses Aedict3 to fix mis-detected kanjis and perform sentence analysis.
Aedict3 OCR is able to work without Aedict3 installed, also Aedict3 works without the Aedict3 OCR installed. To acquire both applications you will have to buy both of these apps.