I played through Season 1 and the 400 days, then uninstalled it but kept the save games.
There are saves and the prefs.prop file in Documents\Telltale Games\The Walking Dead - Season 1\

However, Season 2 doesn't find any.

https://www.telltalegames.com/support/discussion/53784/season-2-save-import-faq-please-read
In the link they say "C:\Users\%Username%\Documents\Telltale Games\The Walking Dead", not Season 1 or 2

p.s. yes, you can rename the "The Walking Dead - Season 1" folder to "The Walking Dead", start the first episode of Season 2 and import the save game. Then name the folder back.

It does work! I just finished the first season, 400 days and found the same problem. Good thing I checked out the forum and found this solution. Thank you and +1 for you good sir/madam

Worked for me too. Thanks for sharing the info. +1

This should be stickied. Very helpful.

worked. thanks!

please someone help me. i cant import my season 1 data to season2. i followed every steps you all said, but didnt worked. what should i do. is thre any way?
in "C:\Users\%Username%\Documents\Telltale Games\The Walking Dead" i renamed the "The Walking Dead - Season 1" folder to "The Walking Dead", then started the first episode of Season 2 but cant import the save game. it just saying unable to import. what should i do ?