I'm new in this forum so sorry for any mistake...
I'm looking since months for MB339 italian acrobatic team download but can't find anything about it. Anybody can help me?
No need to apologize, welcome!
I was unable to find one exclusively for FSX. However as you might know, many of the FS2004 aircraft will work in FSX with the exception of a few gauges perhaps. Have a look at this page:
I would look at mb339pc3.zip and mb339p11.zip. You can only download files from www.avsim.com if you take out a membership - it's free.
Let us know how you're getting on.