If you're not able to download Minecraft properly and you're seeing an crash report that looks like the below error message, it's because of ByteFence, which is known to cause problems with Minecraft. The only way to fix it is to uninstall it.

A typical error looks like this:

Error details: Attempting to move successful download to C:/Users\User\AppData\Roaming\.minecraft\assets\objects\somethingsomethingsomething The process cannot access the file because it is being used by another process

Over at #minecrafthelp we've received thousands of reports of people not being able to download Minecraft because of this. If you're having the same problem, check if you have ByteFence installed. (Other antiviruses can also cause this – try uninstalling it and play MC to see if problem persists.)

(If you need more help, hop on #minecrafthelp and we'll take a look at your computer.)

Problem with straight out buffs is early game players get an impossibly hard game, while late game players get a slight challenge.

So instead of buffs, I think there should be changes to just how powerful a player can become.

A huge problem with this games balance is the Protection enchantment. It reduces all damage. Why would I bother with Projectile Protection, or Blast Protection when a full set of Protection IV does the exact same and more? You don't. Any player who's played for more than a month knows that Protection trumps all other Protection types.

Protection should be removed. Hold on though, I know what you're thinking: "What about melee mobs or players? Melee will become too OP with nothing to protect against it!" That's why I also suggest a new enchantment:
Piercing Protection.

It would go to tier IV just like all the other Protection enchants. It would affect melee damage from mobs or players just like the current Protection does, except that's all it protects against.

There should also be Magic Protection, protects against magic damage like Protection but not anything else.
And as you may know, Protection enchantments can't be combined with other types.
So now we have a system where you can decide what you want to be protected against the most, or use one type on each armor piece to be protected a good amount against anything. Or you could go full melee tank. Or if you're better with a bow you might go full Projectile Protection.

TL;DR: You should be able to excel in some areas with enchants, or have a decent amount of protection against anything, but not all around full damage protection against everything like the Protection enchantment does.