Mojang just recently announced on minecraft.net that since Telltale Games now went defunct, the game will no longer be supported, meaning that you have until June 25th, 2019 to dowload all of the episodes for two seasons. Otherwise, you'll have to watch the seasons on YouTube.
If you have either seasons of Minecraft: Story Mode, you'll need to make sure that you get all of the episodes downloaded BEFORE June 25th, 2019.
I know, I'm truly upset about this, but it has to be done. Again, if you own either seasons of MInecraft; Story Mode, you'll need to make sure that you have all of the episodes of Minecraft: Story Mode downloaded before the service discontinuation on June 25th, 2019.
Thank you so much for understanding, and I truly apologize for the inconvenience it may have cause if it upsets anyone.