If I Buy A Ts20 Steam Key, Will Steam Upgrade To 21?

Just wondering for a cheap way to save money. If I buy a 4 pound TS20 steam key, will steam upgrade it to 21, as I don't wont to spend so much money, and also not waste it

 

Also do you think it will be safe to buy it from this website?
https://www.gamivo.com/product/trai...xsOMr_0w0d72FGgUQ-WGQ8NtZkWfM9LRoCPfwQAvD_BwE

 

Can't vouch for the site but, presuming the key is legit', it will get you the TS2020 routes bundle with the latest version of the core program. Buying an older edition is a good way of getting started or adding to your collection of routes if you already have TS.

 

Thank you, i hope it will work as it is very cheap

 

Also i dont have any other train simulators, this is my first one, will it still work?

 

This is for Train Simulator if you had a different one installed - like Trainz then it would not make a difference