Hey shibes,

If you follow the main sub, you probably already saw this: http://www.reddit.com/r/dogecoin/comments/2egjqg/dogecoin_core_18_released_mandatory_upgrade/

Now, to make it very easy: You have to update your wallet before ~Septemer 12th (block 371,337).

To do this, head over here: https://github.com/dogecoin/dogecoin/releases/tag/v1.8.0
and grab the file you want. For Windows you usually want the installer.

Then just follow this:

1. Backup your wallet! This is very important! Go to File -> Backup Wallet, and save this file in at least two safe places for a good backup.
   
2. Exit the client you're running now.
   

3. Install the update

   1. For Windows, use the setup.exe to update.
      Windows 8 info: If SmartScreen pops up, click More Info then Run Anyway.
   2. For Mac just overwrite the version you currently have in you Applications folder.
      
   3. For Linux you'd overwrite your current dogecoin-qt binary with the new one.
      

4. Start the client, confirm the reindex prompt and wait. That's it :)

Yes, there will be an "error" popping up. Just confirm the prompt for the reindex. It will take a while depending on the speed of your computer. We've seen 30-90 minutes. It's not a re-download, just a restructurinrg of the blocks you already have.

If you have more questions, you can ask here or on the main thread, and we'll try our best to answer everything :)

MultiDoge and Android updates will follow soon!

-langer_hans