PROBLEM SOLVED.
11.64 installs without any problem. I stick to that version on this machine.

Thans for your reaction, 12.17 doesn't install, I tried before posting my question. So Or I need a newer installer inside win2000?? or an older version. - wich one is the last that installs in win2000?

On one machine I use win 2000 for old applications, I still need. I'm looking for a relatively safe browser for win 2000. what is the oldest version of Opera I can use ??? Thanks for indications the version number.
Ferdinand