Right, I've uninstalled and deleted any remaining files in my Program Files/OpenTTD folder.
1) Installed OpenTTD from here:
http://binaries.openttd.org/releases/1. ... -win32.exe
2) Whilst installing, I allowed it to download openGFX, openSFX and openMSX
3) I now go to this page for further instructions:
http://wiki.openttd.org/32bpp_Extra_Zoom_Levels
4) I download this for my GAME file:
http://bundles.openttdcoop.org/32bpp-ez ... rce.tar.gz
5) I skip downloading the DATA files as I already have openGFX and openSFX installed
6) I download this for my 32bpp graphics file:
http://jupix.info/openttd/gfxdev-nightl ... -04-29.tar
7) I download this for my 32bpp_extra.grf:
http://bundles.openttdcoop.org/32bpp-ex ... ly-r39.zip
We then moved onto the install process outlined on the wiki page.

"1. Extract the Game files into a
Game Folder folder of your choosing." Ok, first problem, when it mentions
Game Folder, is it referring to the directory that OpenTTD is installed in? (eg, C:/Program File/OpenTTD/), because there is also a OpenTTD directory within "My Documents" which has all my game saves and downloaded GRF's, and that also has a DATA folder within it (which is relevant because the next step of the wiki page instructs me to "Extract the OpenGFX and OpenSFX files, into the
Game Folder\Data.".
So, at this stage I have now come to a halt, as I don't know which directory it's referring to.
After a bit of pondering, I'm going to assume that when it refers to
Game Folder it's meaning my C:/Program Files/OpenTTD folder.
9) The wiki page instructs me to "Extract the Game files into a Game Folder folder of your choosing.". So, I extract the files, and am left with a folder called "openttd-32bpp-ez-1.1.0", which I copy and place within my C:/Program Files/OpenTTD folder.
10) I skip the next instruction "Extract the OpenGFX and OpenSFX files, into the Game Folder\Data." as I already have them installed when I installed OpenTTD.
11) "Put the 32bpp graphic files (TAR files/Nightly pack) in the Game Folder\Data as well. (There is no need to un-tar the .tar files, but .zip files need to be unzipped)". So, I copy "32bit-gfx-nightly-megapack-2011-04-29" and place it in my C:/Program Files/OpenTTD/Data folder.
This is where it gets a bit confusing again. Going back to step number 4 of the Download section says "32bpp_extra.grf - download latest 32bpp_extra.grf file and put it to <game>\data folder. ". Fair enough, I click the link and downloaded the file there, which is a zip file. If I extract that zipfile, there is another zipfile and a docs file. So I unzip that next zipfile, and within that is the 32bpp_extra.grf and also a SPRITES folder. I assume that this sprites folder is not used, as there is nothing in the instructions about this?
12) So I proceed and place the 32bpp_extra.grf file in my C:/Program Files/OpenTTD/Data folder (this is my GAME folder), and activate the grf within the game.
And....
It doesn't work. I've got broken tiles where the grass meets water, and no extra zoom.
Where have I gone wrong?
