Hello!.
No, thats waht I thought at first, and I tried in different moments and days before I post here, but with the same result.I guess that something "bad" or "corrupted" must be in my ssd where I haved installed Launchobx, because I tried a clean installation in a different hard drive, only to check whats happen and mame emulator download perfect there when I starting the process to install mame.
What I did is choose that emulator "manually" and installed mame where I initially wanted.I supposed that if anyone more have this problem, its only me and something bad still there.
Thank you anyway for your answer.