[Typo3] phpMyAdmin ext install problems

[Robert Markula]

Hi there,
I fail trying to install the phpmyadmin extension 0.1.0. Although 
[EXT][allowGlobalInstall] = 1, it throws the error "Error: The extension 
can only be installed in the path typo3/ext/ (lockType=G)".
Ok then, so I tried to download the t3x file from the TER, but there is 
no downloadlink at all.

Am I thinking the wrong way here (probably) or is there a problem with 
this extension (can't image but...)?