The letter is only for owners of the S8 advanced. If you own this and don't receive the letter contact JT support. I have had problems with these kind of offers in the past.
S8 Advanced Update:
There's a New S8 Advanced Undeground Stock software now available with updates, fixes and 13 new scenarios for Just Trains' forthcoming Metropolitan Line route add-on.
Current owners will have received an email from us with details of the update and also with your discount code for the Metropolitan Line
The post was edited 1 time, last by holzroller ().