If they make X10 free then all people who bought X10 will say we want our money and it makes lots of struggles but there is a better way.
They can put another update which can work with both and wont work with one.
The new update just let the guys who have installed both X9 and X10 to have one folder for both and will manage them and just by opening one of them you can choose to test the game in X10 or X9 type.
About the shaders:As the shaders are different in X9 and X10 they can add a new line when you right click on an entity you can see two line like this:
X9Shader:----
X10Shader:----
And you can choose for both but in X9 type the first one works and the second one will disable and if you choose X10 type the second line will work and the first one will disable and if there is nothing in X10Shader line as X10 supports X9 then it automatically run the X9Shader for both X9 and X10.
And for updates you can choose the type first then you'll update the right one.
Or they can place new updates for X9 and X10 separately and together for better choose.
Have our guns was a mistake!!!
I am PaYaM