tried to reinstall Studio 4b52 on W2000 system because It could not find WinAvr anymore ( Why? nothing changed!) . First I deinstalled. Halfway installing I got an error. Did not succeed installing.
Today (on another PC with XPSP2!) I downloaded 4b60, deinstalled b452 , installed 4b60 the same problem! it goes wrong when installing IEC50.dat . Error unrecoverable error ( no nr).
Tried to install to a different dir: it gets stuck at IEC30.chm.
So be warned
I contacted Atmel about it.