Booklet creation work around
Hi, if getting a pdf document in the right order, perhaps even from multiple sources (as long as the page dimensions are the same. See note lower down re Powerpoint, also applicaple to software that doesn't allow for bleed) use free programs like Adolix to add, split, merge (to keep it free you might have to do a merge a few times, i.e. add maximum pages and create one pdf, then do that to another group, then merge the two resulting PDFs again etc). Then, to get your pages in the right sequence, layout for your purpose you need to make what the trade calls an imposition. (to get it right get some A4 sheets of paper and fold them individually, then insert them inside each other. then number the pages (straight numbers: if you have A, B, C or Roman numeral pages, for this purpose they are 1st, 2nd etc pages)
Now go to an imposition software, free, online, sign up upload your pages and work through the sequence of steps and at the end, if you've done it right you'll get a pdf which is ready to print and finish (FST fold, stitch (staple) and trim round the edges).
I strongly recommend to have a dummy run with a multiple of 4, something like 8 or 12 pages first, before trying to impose a mamouth stitched maximum of 96 pages (get the printshop to do that, they have efficient tools for the purpose)
If you have PagePlus X9 still (now legacy) you can import PDFs in the outline or image option, shunt the pages around to your requirements and re-export to an imposed PDF file
(word of caution with Powerpoint: you must go to custom page settings and enter the dimensions in manually, (i.e. Don't use the A4 setting as it's just insuring that the slide fits on an A4 sheet but is NOT A4.) so for A4 that would be in cms: 29.7 x 21 (last time I checked I didn't see a mm option but that was a while ago). and if you have print that goes to the edge you need to allow for bleed (overhanging image to be trimmed off) at 3mm on every outer edge and add that so the dimensions now are 30.3 x 21.6)
Hope this helps to solve someone's problems a little