If I log on to the MInecraft.net site with my Acc data, everything is okay but if I want to download Mc, there will be a window where I have to enter email and then somehow I have to buy Mc again. Could anyone help me, please?
You say somewhere that you already have Minecraft and you come directly to download
Info: The game is free, but to make an account is charged.
Sorry but I do not really understand why you have a window and you have to buy MC.
Do the following:
Go to Google and just write Minecraft install. But do not go to the MC site.
Usually you download the launcher.
Then you have to log in with the account you bought. And then you have to choose the version.
Hope I could help you. GL
