it's folder not deleted

Awesome, worked :-)

what worked for me was left click on game click on properties the click set launch options delete the regdit then ok the game works right away on windows 10.

didnt work for me on windows 10

Confirmed. It actually works!

J'ai acheter le jeu making history the clam and the storm depuis le 09/04/17 lorsque je lance le jeu une fenêtre apparaît et me met couldn't find valide license key, please try reinstalling the product après avoir cliquer sur ok une nouvelle fenêtre apparaît et me met failed to intialize game engine game cannot strat depuis je suis dans l'incapacité de lancer le jeu

I found a way to fix it but you should only do it if your desperate. Delete and re install Steam

i've done it but it didn't work :(

for me it just straight up says unable to delete

I have the same problem, but deleting that key doesn't work....what could I do?