I've been using Sony Acid Pro 9 for quite a few years. Last night I decided to upgrade to 11. I got the software link in my email as expected, with product code. I install the software through the bundle pre downloader. Everything installs great. It launches, shows up, plays, no errors. Then the UPDATER, says there's a newer version available. I click the yellow button, then hit install, it goes through it's thing and says complete. No errors at that time. Then I close the updater program and try and launch the A icon for acid. Immediately before anything else, it says Error code -57. I've tried uninstalling 11 and reinstalling it a few times. What's up? Maybe I should just bypass the update program when I first install it because that seems to work no problem.

I don't think you can bypass the udpate now. Somehow Magix imbeds the file somewhere in Windows.

Anyway, with having absolutely no help here in the forums or by Magix, I did a lot of troubleshooting of my own, even re-did windows as my entire studio is now based around Acid pro. So, in my case, what seems to be working is having Windows Defender ignore all Magix applications (Acid, Vegas and their registration files).

Try this: Go to Windows Defender, look for Virus protection and go into "Add an app as an exception" so that win defender knows not to block or delete the given application's files. If don't know how to do this, message back here and I will give step by step.

In my case, mainly the MP3 coder stopped working, I did the above method and it seems to be working and less crashes.

By the way, Melodyne has never worked for me. It was always greyed out. So far, I have not found a working solution for that problem.