How to install a language pack into a now-defunct 3rd-party keyboard?
Confirmed to work on Android 5.1.1 with 8pen version 2.6.1 and 2.7

Since mid-2014, 8pen ( is only accessible from your purchases in Google Play) language packs no longer install for the keyboard since the servers are no longer operating. Luckily, one of my roomates hasn't updated his phone since he downloaded the English dictionary. 

Using Android File Manager I copied the original dictionary file 

Android/data/com.eightpen.android.eightpen 

and loaded it onto my Nexus 7 which has 8pen version 2.7 installed. After clicking to "download" the language pack, it successfully read the new files and the dictionary is operational.

Unfortunately while trying to figure all this out I uninstalled by 2.7 version and can't get it back... but the same method is working on version 2.6 on my Nexus 6.

While this is not the most elegant solution, you can download the file you need from here and copy the folder needed into Android/data. I've included a README with detailed steps. Happy 8penning!

(Now to figure out how to get version 2.7 back.)