At the bottom right of the minecraft homepage there is a download button.
No, once you purchase a Minecraft account, it will never expire.
No, after you purchase your account, it will not expire.
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According to the official Minecraft site, you have to purchase the game to play it.
Yes it currently costs $26.95 (USD) to purchase Minecraft.
You can go to the main website of Minecraft(.net) to purchase and download the game for your OS
Minecraft is only available for purchase online via minecraft.net.
https://minecraft.net
maybe your minecraft is for windows or you haven't actually purchase the real version, like using anjocaido's minecraft launcher
At this time, the only way to purchase Minecraft is through the website, which means you can only purchase it with either a credit card or through a PayPal account.
No, you can only purchase Minecraft digitally.(eg. Their official website, Google Play etc.)