How can I go back from X11 version 7.2 to version 6.99 ?

[didi]

After updating from version 6.99 to the new 7.2 last week,
nothing works like before.

Now I need to go back to a former version, but it seems , there is no 
"easy way" button in the setup-GUI. How can I go back ?

Is there any possibility to create an installable image from another 
machine with version 6.99 ?

thanks
Didi


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