I'm afraid buying the DLCs on one storefront can only unlock them on your account for that storefront. However, nothing will stop you from moving the DLC files from your Steam folder to an Itch folder!
I didn't know you could move files to the itch folder! I did it and now I have the dlcs on my mac as well thank you so much <3
No problem!
hi! how did you manage to do this? i need to move my saves from mac to windows
