Error while installing DynamicsAX2012R2-KB4086133

Hi,

I am new to installing hotfixes.

There is a new hotfix KB4086133 which needs to be installed for DAX2012R2 but error has occurred while installing the hotfix.

Evaluating installation state of Application Object Server instance 00.
MSI file: ObjectServer64.msi Installed: False

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.Evaluating installation state of Application Object Server instance 99.
MSI file: ObjectServer64.msi Installed: False

=== Setting up Model Database ===
Updating model database “DAX2012R2_TEST_Model” on server “vsddb1\test”.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.
Update model details metadata not available.

AxUtil call returned errors:
Violation of PRIMARY KEY constraint ‘PK_ModelElementData_ElementHandle’. Cannot insert duplicate key in object ‘dbo.ModelElementData’. The duplicate key value is (892320, 1).
The statement has been terminated.
Error updating model database: Microsoft.Dynamics.Setup.AxSetupException: AxUtil call returned errors:Violation of PRIMARY KEY constraint ‘PK_ModelElementData_ElementHandle’. Cannot insert duplicate key in object ‘dbo.ModelElementData’. The duplicate key value is (892320, 1).
The statement has been terminated.

Let me know how to fix this.

One more question: is there a checklist to be followed before installing hotfix? any basic pre-requisites, please let me know.