after latest update win10 it's impossible to save video files using "CamStudio program"

When I try to save video files in default box or in other virtual areas (I have Pro program not free) always appears this message:

"File Move Error. Unable to move or to rename/copy file. The source file may be opened by another application or destination file still exist. Please use another filename."

Before this last update of Win10 everything was well!!!! What can I do to resolve this problem? I tried various solutions but I did not report the problem.

Ty for your help