The build number of FineReader Engine and FlexiCapture Engine is an information which allows to check, whether you are up-to-date with ABBYY OCR technologies.
The build number of FineReader Engine and FlexiCapture Engine can be found in FREngine.dll file properties.
1. Open "Bin" subfolder of your ABBYY product installation folder.
By default, for FineReader Engine 12 it's C:\Program Files\ABBYY SDK\12\FineReader Engine\Bin, for FlexiCapture Engine 12 it's C:\Program Files\ABBYY SDK\12\FlexiCapture Engine\Bin
2. Find fine FREngine.dll for FineReader Engine or fcengine.dll for FlexiCapture Engine.
3. Open the file properties
4. Open "Details" bookmark
5. Check the product version value.
Your Engine build version number is also displayed in the application log. Please check https://abbyy.zendesk.com/hc/en-us/articles/360002653499 for how to generate this log.