I use it & have no issues with it...............use the trial version to see how you get on with it.
I have mine set up on a laptop & (before it went wobbly) a desktop pc & use the import export cert feature a fair bit, can also email certs to customers along with an invoice so saves on postage.
You can add your company logo & scheme operators logo, so with a change on fonts to purple & the nicey DI logo, I haven't purchased any certs from nicey in years.
I think its just a code you put in at time of purchase for the discount..............see the link
http://www.talk.electricianforum.co.uk/topic/12496-10-discount-on-tysoft-easycert-products-for-all-talkelectricianforumcouk-members/
Or buy a shed load of forum charity Xmas raffle tickets..................... Easycert mobile is a prize so i'm told.