only changes in the <activity> XML tag described above
In the original XAML file find in <activity> tag
VisualBasic.Settings="{x:Null}"
and change it to
mva:VisualBasic.Settings="{x:Null}"
and add
xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities"
all XML schemas that refer to assembly System.Private.CoreLib
e.g. xmlns:s="clr-namespace:System;assembly=System.Private.CoreLib"
must be changed to refer to assembly mscorlib
e.g. xmlns:s="clr-namespace:System;assembly=mscorlib"
Seems to be the same what is described in Windows-Legacy - #4 by 447_J_U_S_SANDEEP
Cheers