Could not sleep!! So I just checked to see if 7.62 worked with the plugin, all I have done to check is not use object filter at all, changed the start AF level from 8 to 16 to match the starting point of the 3 options in main loop, set AF on the object prior to main loop, remmed out the contents of the three main loop options and added the command to change the AF level for each of those options - 16x, 2x and 0x respectively. (So I have altered 1 line, added 4 lines and remmed out 4 lines);
//Anisotropic filtering with terrain demo
//Written by kaedroho (www.blitzwerks.co.uk)
//TO COMPILE THIS DEMO, YOU WILL NEED THE BLITZTERRAIN DLL
//GET IT HERE: http://www.devstorm.co.uk/viewtopic.php?f=24&t=38
//Startup
sync on:sync rate 0:sync
hide mouse
//Check if the users computer supports anisotropic filtering
if anistropicfiltering available()=0 then end
//Use 8x Anisotropic filtering
KD SetAnisotropy 16 //set this to 16 if you want super quality!
//Load media
load image "media/detail.tga",1
//Make plain
make object plain 1,100,100
xrotate object 1,270
texture object 1,1
KD EnableObjectAnisotropic 1
KD SetObjectAnisotropicFilteringOn 1
//Main Loop
StartTime=timer()
do
//Movement
position camera 0,0,0
rotate camera camera angle x()+mousemovey()/4.0,camera angle y()+mousemovex()/4.0,0.0
move camera -100
//Toggle filtermode
if keystate(59) //F1
if F1Nopress=0
F1Nopress=1
dec Filtermode
if filtermode<0 then filtermode=2
if filtermode=0 // Anisotropic
`set object filter 1,2
`KD SetObjectAnisotropicFilteringOn 1
KD SetAnisotropy 16
endif
if filtermode=1 //Linear
`KD SetObjectAnisotropicFilteringOff 1
KD SetAnisotropy 2
endif
if filtermode=2 //Point
`set object filter 1,0
KD SetAnisotropy 0
endif
endif
else
F1Nopress=0
endif
//FPS
text 10,10,"FPS: "+str$(screen fps())
if filtermode=0 then text 10,20,"FILTER: ANISOTROPIC"
if filtermode=1 then text 10,20,"FILTER: LINEAR"
if filtermode=2 then text 10,20,"FILTER: POINT"
text 10,30,"PRESS F1 TO CHANGE FILTER"
//Update
sync
loop
Using u7.62 the plugin does appear to be working

Cescano perhaps you could give it a try using this upgrade and report back, not going to do anything else at this point, will look at shader option later so anyone with later upgrades have the option to use, as now I do feel like I can actually drop off to sleep
Edit 2 : Well I don't think I am going to get any sleep any time soon, workmen have decided to set up shop outside with drills! Anyway took me less than a minute to sort shader out, I was going to look for a basic shader and post that with the alteration but then its so easy to do theres not much point, so near the start of whatever shader is being used, in the sampler simply write the following:
MinFilter = Anisotropic; MagFilter = Linear; MipFilter = Linear; Maxanisotropy = 16;
I hope this wraps things up for you, be sure to let us know