Concrete update but use old design

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Hi,

For some of our websites we want to update concrete due to bug fixes etc, but keep the old template because the new template really doesnt work with some modules we created for some websites.

At one server we build a complete CRM inside concrete5 and with the new design it really doesn't work well.

Is it possible to use the old design in the newest update of concrete5 ?
Where can I set this ?
If not, will you make it possible in a newer version to switch back to the old look ?