This is a set of bad scans about a different vehicle.
What you are getting is a zip file with fairly random, bad scans of a peugeot J5. While that peugeot motor shares a lot with the citroen C25, it is not the same. Selling this as 'official workshop manual' for the citroen is highly misleading.
The zip file is very badly organized.
Also included is a non official repair manual for the C25, which is a bad scan and only covers the petrol models.
The legal status of these scans looks very dubious to me too (copyright)