You'll need to go to "Settings" then "Security" and make sure "Unknown Sources" is ticked then click "OK" if a warning pops up. Assuming the file is on the tablet already, go to it in file explorer and tap on it. You should get the same message come up that you get when installing from Google Play. I don't personally have this tablet but the instructions should be the same as with anything running Android 4.0 so I hope this helps.
I'm not sure the folder matters where the file is because it will get moved automatically during installation (I installed straight from /sdcard/download) but if it doesn't end in .apk it might not be the right file. If its the wrong one, just download it again from http://www.apktops.com/wp-content/plugins/download-monitor/download.php?id=1406 which is the same place I got it from and it works fine.
I went back to the itv player file and deleted zip or was it sfp basically the last 3 letters and replaced/renamed them with apk and like magic the file changed to the itv player icon. I tested it and after signing up it's now working. Tried it with some of the other apps too which are now loaded. Good thing as I was getting a bit fed up after BBC iplayer froze on me several times this eve.
Thanks. I downloaded them direct to the tablet but will remember your advice for next time.
I think I spoke too soon with the itv player app, it doesn't stream very well and is unwatchable at least I can occasionally watch bbc iplayer before it freezes. I have the latest flash installed not sure what the issue is but it's really annoying.
I know someone else was having similar issues with 4oD, whereas I could watch it ok with just a bit of stuttering at the beginning during the adverts. You could try making sure all apps are closed first, or as a test, shutdown and restart the tab, then try to play from ITV before doing anything else.
I use ITV player with no sync issues and it responds fairly well. Download Adobe air from the play store then locate itvplayer.apk on the web and install.
Tip: Install google drive on your PC and tablet. (5 GB of free storage) Download itvplayer.apk to your PC if the file ext is not apk, rename before copying to drive folder. Your tablet drive folder will sync, click and install.