Or have you not updated your Krita to version 5.x yet, and are using Krita in version 4.x, or even 3.x? If so, you need to update to at least Krita 5.x, you always can find the most recent version on Krita Desktop | Krita
From where did you download the bundle? You haven’t by chance downloaded it via Gumroad and chosen to download the ZIP-Package? If so, did you extract the bundle from the ZIP-Archive?
