I downloaded what I believe is the latest HDMI design from github, and it looks to be 2014.2. Is there going to be an update to Vivado 2014.4 soon?
Our next release will be on 2014.4, but you don't need to wait for that. (we recently made our latest release)
You can simply install the 2014.4 beside the 2014.2, compile the project with 2014.2 and reopen it with 2014.4. The GUI will guide you through the update process of the IPs. And if you have some luck, won't appear any unwanted issue or conflict.
Sometimes upgrading a project can be painful, this is way we are supporting just 'even' versions.
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