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sooo...I have to buy the game again here, although I already paid for it and own it in the Itch-Launcher? Or is this for those who want to buy you game? Any new updates on the programming help front? Why can you upload the actual premium version here, but not in the original shop front? Are there problems with the Itch Launcher or something, which is directly connected to your customer*s accounts? Sorry if I sound weird, but I am confused.

No you shouldn't have to buy the game again. If it's showing you that, then it's an error, probably because for awhile the game had a different purchase method.  I was unaware it was asking people to pay again until you said something. It means I will need to update it directly through a different method. I did not upload the "actual premium version here", as much as attach it from a previous post because Itch allows me to do that. I didn't want to spend extra time uploading it directly because I had hoped it would be fixed by the end of that day, and I wanted to upload the new one, but the programmer didn't get back to me yet.

Tl;DR there should be no issue with the Itch launcher, it just wasn't updated with the old version through that method yet because at the time I was hoping to update it with the new version, and thought the old version it allowed me to attach would be free for those who bought it as temporary stopgap.