To roll your Dimension version back to version 7.0-11 follow the steps below.

NOTE that the Dimension Installer retains prior versions in the Windows Program Uninstall Dialog.  You will either:

(1.) Uninstall a few versions of Dimension, then install the Dimension Upgrade Version 7.0-11.

OR 

(2.) Uninstall all versions of Dimension, then install Dimension New Version 7.0-11.

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(1.) If the Programs and Features Window has versions lower than 7.0-11 similar to the list below, you will need to uninstall the highest version backwards to and including Version 7.0-11. 

In the above example, you would perform the following steps in order:

• Uninstall "eTakeoff Dimension Upgrade Version 8.00-11"
• Uninstall "eTakeoff Dimension Upgrade Version 7.00-11"
• Install Dimension Upgrade Version 7.0-11

(2.) If the Programs and Features Window does NOT contain prior versions to 7.0-11 similar to the list below,  you will need to uninstall the highest version backwards to and including version 7.0-11. 

In the above example, you would 

• Uninstall "eTakeoff Dimension Upgrade Version 8.00-01"
• Uninstall "eTakeoff Dimension Version 7.00-11"
• Install Dimension New Version 7.0-11

WARNING : If you want to clean up ALL previous versions of Dimension, do NOT uninstall versions 5.06-29 and below without making a back up of your project / data folders and files first.