AWS MGN uses the version of the Launch template that is marked as default.
In order to select the default launch template, on the Modify template (Create new version) page, under the Launch template name and version description category, open the Source template menu and choose the EC2 launch template you want to use as the default template from the drop-down menu.
Every time you modify the Launch template, a new version of the launch template is created. You will be notified that the Launch template has been modified and that a new version (version number) has been created. Make sure to take note of the version number and the Launch template ID so that you could easily identify your launch template and version.
Note
It's good practice to delete versions of the launch template that you no longer need.
To set the new version of your launch template as the default:
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Navigate back to the main EC2 > Launch templates page.
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Choose your launch template by selecting the toggle to the left of the Launch template ID.
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Open the Actions menu and choose Set default version.
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Select the Template version from the drop-down menu and then choose Set as default version.
The Amazon EC2 console will confirm the version change.
