c. Click on "Inventory History" in the dropdown menu
Please make sure, steam is set to english.
From version 1.2.3 upwards, it should work nonetheless, just to make sure you don't get confused by the language.
3. Click on "Load Stats"
This will take a while, depending on how many items you have. After a certain amount of requests, steam will give the script a cooldown, afterwards it automatically picks back up.