These tricks may only work for certain occassions, however..
They did fix my issues so I'm hoping they will help you as well.
First things first,
If you are getting this at launch:
1.) Completely uninstall your Aika. (WTF? I know right? ha)
2.) Download the aika client from http://aika.t3fun.com/Download/Client.aspx
3.) Load the client and begin install...
You'll probably come to this if you try and zoom through this,
TO AVOID issues with installation..
1.) Change download location:
2.) When you've changed the location hit install
At this point your aika should download fine now, with no error.
Your last step on this, is to RESTART your computer.
On reboot, for avast users... While trying to patch you may run into the:Downloading Failed - Open [AIKAClientGB140409.zip]
To fix this issue,
1.) First close your browser
2.) Then find the ^ (for windows) or your hidden icon menu on the toolbar.
3.) Find the avast anti-virus icon and right click.
4.) Disable your shields, I have faster internet so I just disabled for 10 minutes. I tech. only needed less than 2 minutes.
5.) On launch of the game, quickly tab back to your desktop and re-enable the avast shields.UPDATE:
If you re-enable the avast sheilds.. theres a 70% chance if not more, that Avast will delete or corrupt the .exe again.
Which of course would cause you to re-install all over.
The only fixes for that atm is 1.)
Change anti-virus or 2.)
Play without avast enabled.Happy Gaming!