I don't know which OS or version you are using, as different environment has different path. But basically:
itch save location (Firefox):
C:\Users\[user account name]\AppData\Roaming\Macromedia\Flash Player\#SharedObjects\[RANDOM LETTERS]\commondatastorage.googleapis.com\itchio\upload2\game\[RANDOM LETTERS]
Local save location:
First narrow down the scope by going to this directory. **(See how to unhid AppData folder if you have it hidden: https://cybertext.wordpress.com/2012/05/29/cant-see-the-appdata-folder/)
C:\Users\[Your User Name]\AppData\Roaming\Macromedia\Flash Player\#SharedObjects\[Random Number]\localhost
And then search with the save's name: TTv4_Save.sol
This path should simulate where you store your exe or swf. For example, if the exe or swf is placed on your Desktop, TTv4_Save.sol should be inside a folder call Desktop. Also exe and swf saves aren't compatible with each other.