In this older video it is done by editing the registry. It is changed from Russian to English. If it still works the same way you need change the numbers the other way around.
I have Sound Forge 12. There language can be changed under Computer\HKEY_LOCAL_MACHINE\SOFTWARE\MAGIX\SOUND FORGE Pro\12.0\Lang
Thank you! I hopeed it moght help. But unfrotunately it did not. I changed code from 409 to 419 but after that Sounf Forge did not launched at all with and erroк messege 1. Seems to me somethogn was not installed to make it happened
I think the best is to ask sales support at infoservice@magix.net to give you direct download link for the russian version installer. I hope for you that the language is still maintained.