Hi Ahmed,
You should be fine with the 2 PAK's. Register these so you can recieve the new 6.x Feature Licenses. When you get the email back from licensing@cisco.com you will receive a confirmation that will be used with Step #3 below.
Check out Pages 170-174 of this rather large pdf. The methods for obtaining the 6.x license are nicely explained;
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/6_1_1/ccmcfg/bccm.pdf
Upgrading From Cisco Unified CallManager 4.x Releases
When you upgrade from supported Cisco Unified CallManager 4.x releases, the system calculates the licenses that are required for existing devices and existing nodes and generates an intermediate file (XML file) that contains this information. You use this file to obtain license files that you can upgrade into Cisco Unified Communications Manager Administration. You receive these licenses free of cost because you are already using these phones for a Cisco Unified CallManager 4.x release. Use the following procedure to obtain licenses for Cisco Unified Communications Manager when upgrading from supported 4.x releases.
Obtaining a License File
Procedure
Step 1 After you complete the Cisco Unified Communications Manager Administration upgrade process, as described in Upgrading Cisco Unified Communications Manager, navigate to Cisco Unified Communications Manager Administration and choose System > Licensing > License File Upload.
The License File Upload window displays.
Step 2 Choose the licugrade_.lic file from the Existing Files drop-down list and click View File. A pop-up window displays that has the license information for existing devices and nodes. Copy this information. To copy the contents on this window, you can use Ctrl-A (Select All) and Ctrl-C (Copy).
Step 3 Navigate to the License Registration web tool at https://tools.cisco.com/SWIFT/Licensing/PrivateRegistrationServlet?FormId=806.
Step 4 Enter the MAC address of the Ethernet 0 NIC of the first node of the Cisco Unified Communications Manager in the cluster.
Step 5 In the text box that is provided, paste the license file contents that you copied in Step 4 by using the appropriate keyboard shortcuts, such as Ctrl-V.
Step 6 Enter a valid e-mail address and click Continue. A license file generates.
The system sends the license file to you via e-mail by using the E-mail address that you provided.
Step 7 You must upload the license file to the server with the matching MAC address that you provided in Step 4. See the “Uploading a License File†section on page 28-7.
Step 8 You can obtain licenses for new devices that you are adding to the upgraded system, if your system requires additional device license units.
Question #2
DMA is just is run on the 4.2(3) Publisher only. This is done prior to starting the upgrade. Choose the Windows migration option on the build of the first new 6.1(x) Node:(
Import Windows Data
This option allows you to import database information from a Cisco Unified Communications Manager 4.x system by using a file that the Data Migration Assistant (DMA) tool produces.
Upgrading the First Cisco Unified Communications Manager Node
When you choose Windows Upgrade, the installation wizard prompts you for the location of the preexisting Windows configuration information that the Data Migration Assistant (DMA) tool created. See the Data Migration Assistant User Guide for more information on the DMA tool.
Step 1 - In the Windows Upgrade window, import data from a Windows version of Cisco Unified Communications Manager by choosing Yes
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/upgrade/6_1_1/upgrd611-pdf.pdf
Hope this helps!
Rob
