Are you talking about this 1-month plan to successfully kick off your transition? I found this on the new Workfront experience page here, on the Featured tab, but I know there are also a LOT of resources available that I'd encourage you to explore on the Resources tab as well.
If that's not what you're looking for, let me know and I can keep digging.
So if you are able to download the zip file, can you follow these instructions? I'm trying to determine where the issue might be!
Does that work for you?? If not, please let me know!