As I've only used this in English, I am unsure.
One hypothesis is to only search one or the other and to change that possibly is to do this:
Find each template one value that looks like this:
<input type="hidden"
Add below:
<input type="hidden" name="hl" value="en">
change en to whichever language code you wish.
Multiple languages I am unsure about, but this is the closest I suspect would work.

I installed it correctly but i can't see google search anywhere?!

just upgraded, thanks david

No problem - in about a week or two I will have 1.7 released with a few new features.

Are you referring to the search boxes or the searchresults.php file? If you are referring to the former, are you using your navigation in the header?

I get this same error and i've entered the google publication id both ways, with and without the -

Could someone help? Thanks!

Does yours look like this:
Example: partner-pub-0123456789012345:lnucfbm5dtp

Just looks like this;

Publisher ID: pub-8796421228273350

What do I need to do in order to get it looking like your example? I'm not very learned in this field as i'm a beginner at this stage so a short guide would do wonders!

Thank you!

log into your adsense account http://www.google.com/adsense and click on Adsense setup tab. Then, click on AdSense for Search Improved! Walk through the steps and at the end, you will see your new partner-pub ID.

Don't forget to click Install.

Thank you very much! :)

Don't forget to click install :)