Yeah, so I figured I'd write this quick guide to help my fellow Arlorians who have been unable to download AL's new client due to the evil "Error: -18"
So What Is Error: -18?
Honestly, I don't know much about this, other than the fact that its a Google Play issue that happens when Android's smdl2tmp1.asec file becomes corrupted (which happens somewhat often)
There's not much documentation provided by Google's Support documentation 
A few things before we start- Power off your android device before removing the SD Card
- Yep, thats about it...
Android OS creates a file called "smdl2tmp1.asec".
It is most likely the reason that causes Error: -18
btw, you can delete this file, but it will keep being re-created by Android OS
Error: -18 happens when the smdl2tmp1.asec file becomes corrupted
Step 1
Remove your device's SD card, and plug it into the card reader on your laptop
(or if you don't have a laptop and/or a card reader, just plug your device to your computer directly)
Step 2
locate smdl2tmp1.asec
Code:
/sdcard/.android_secure/smdl2tmp1.asec
For those who don't understand the line above,
LOCATE the "sdcard" folder from your device's folders
LOCATE the ".android_secure" folder
FIND and DELETE "smdl2tmp1.asec"
Step 3
Download AL via your Android device's google play store
Enjoy
[ANDROID] How To Fix Google Play Error: -18"
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