I have a pdf with 14 A4 (Landscape) pages, each of which consists of 2 A5 (Portrait) pages. I need to print this for an old lady whose sight is somewhat impaired. So I need to enlarge the text so that, say each original A5 (half of an A4 page) gets the size of an A4 page.
In principle, I need to extract the two A5 pages from each A4 page, so I can manipulate (enlarge) them afterwards.
I know only of doing the opposite: putting two A5 pages on one A4
I am using latest TeXLive in Xubuntu 18.04
Can somebody give me a hint (or better: a solution)?