Hello, I have at problem Installing Diablo 2 EXP.
When I have to type my CD-key, it's ask for "26" numbers Character key.
But my CD-key its only "16" characters?

Assuming you're using the digital download method, click on your d2 game on your blizzard account and it gives you the 26 digit code there.

Following this download guide you should receive a key with 26 numbers.

Thank you very much :-)

Enter your 16 cd key, they will autochange your key