Yes
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You can get it from the minecraft website.
You can play the free classic mode on the Minecraft website.
If you are downloading it off the disney website, it is most likely virus free. Make sure you are on the disney site, or it could be contaminated with viruses.
No, nothing is completely virus free on the internet.
It is hard to get full version free game, and those free game download website might contain virus, which is a nightmare.