Launch and load your document from within BRISS and configure the double page scan as you can see below. Notice that I at the same time I am cropping the lower part of the pages. The curser triggers a cue tip which shows that the left side corresponds to the uneven numbers of the document.
At this stage you may check out a preview (i.e. Action -> Preview) before actual cropping and merging (i.e. Action -> Action). The latter is a one-go and quick operation and the developers deserve kudos for their contributions to the community.
Edit and convert PDFs
Scan documents and OCR