Downloading from the Marketplace and Installing manually the current version of Portfolio on Jira 7.10 is currently unsupported, it might work but could result in some error or unexpected behavior.
So while it is not impossible, I can not in good conscience recommend it and would instead advise waiting a few days for a new version of Portfolio to be released.
To see this feature in action check out our recent dependencies demo here: https://www.youtube.com/watch?v=eQu5VsUqyZA Keeping on top of your dependencies is a key part of ensuring project success....
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