The file is a pdf, most computers can view pdf files, in fact most browsers will let you view it as though it was a web page. Be a little patient, it will take a couple of minutes to download as there are 20 pages, much of which is full colour photos - it's worth the wait!
The Heucheraholics catalogue has Jooles own descriptions for all of the plants within it. Unlike most web sites and catalogues Jooles has created descriptions that avoid USA terminology - and she has done them in her own inimitable style. We can't promise that all the varieties in the catalogue are available all the time, so look at the main web site for details of availability.