[SGT2 7.0 WiFi GT-P3110] Installing Internal to external memory zip file

Hi all,
Sorry I am a noob so please bare with me.
Basically I bought the 'Samsung Galaxy Tab 2 7.0 WiFi 8gb GT-P3110' and anybody who has it will know that having an External SD doesnt reall let you do anything because unlike the S3 phones, if you put files, music, photos etc. on your Ext SD you cant then use it through your actual Tab.
Well I cant seem to anyways. Everytime I put a film on there via the file explorer on my PC, once I have unplugged it either dissappears or doesnt work.
Im not completely new to this I have been rooting phones and stuff for quite a while so I have tried everything apart from trying to develop something myself as I have NO CLUE what im doing in that department.
I've followed a few links on here and came across the following link:

First thing I done was change my stock 4.1.1 (I think) for the stock 4.0.4 as the link is for that. I then put the Clockwork Recovery Mod on my but putting it on the external SD ad installing it through the 'Power and UP' combination which worked fine.
I downloaded the file from the link on the thread above and placed it on my Ext SD and followed the instructions to install through Clockwork recovery but it doesnt seem to work for me.
It gives this message:

--Installing: /external_sd/ot.zip
Finding update package...
Opening update package...
E:Can't open /external_sd/ot.zip
Installation aborted

Can anyone tell me what I am doing wrong?
Or is there another way to do it?

Any help would be fantastic.
Just to let clarify:
Its a 'Samsung Galaxy Tab 2 7.0 WiFi 8gb GT-P3110
Im running a stock 4.0.4 and its rooted.

Cheers guys

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