Choose this!

1. Go to Minecraft.net

2. if you didnt buy you should or download and dont have account and just play singleplayer

3. Minecraft.net/Download it will also said by buy below it the will be a download Button.

That mostly all Hope this Helps

Have you try fixing it?

*if you didin't fix it you Should try to check where you got it or find somewhere close to where you live to fix it?

If this work i fell good for you            If it Dind't Sorry.