I found out by experimenting that if you use most important words first in the internet search terms you are likely to receive the best search results.
In this case my first search used "alldata promo". The search results gave a few websites showing information about the professional version (high cost), but showed others with the DIY version.
My next search used "alldata diy promo" and here is the snagit copy of the search results:
I found the best promo deal in the 4th website listed from the top "promotionalcodes.com".
Here is a snagit copy of that promotional codes website page showing alldata promo codes - look at the 3rd promo code down "Alldata diy 1yr subscription: $19.95":
Look at some of my other posts that show how to search for Jaguar parts and other jaguar information such repairs and maintenance.
I use internet search term "Jaguar forums" for whatever I need to find it on this forum then the item (such as engine oil).
Here is an example I put in another thread about Cabin Filter:
The internet search term was: "jaguar forums xj8 cabin filter" and here was the results on the search request (It is the 2nd one listed from the top of the list):
Maybe these internet search methods can be a help to many of the forum members if they get a chance to view them.