Halloween Steam Sale for Season 1 to 4

[Xanija]

For those not checking the news section:

http://digitalpinballfans.com/content.php/475-Halloween-Steam-Sale-for-Season-1-4

 

[LamerDeluxe]

I don't know if upgrades to pro versions of seasons are on sale as well, but the in-game upgrade to pro option seems to be broken, it does nothing.
EDIT: Fixed it, the steam overlay was turned off. There doesn't seem to be a discount on upgrades though, all of them are ten euro.