How do I transition between old and new platforms?

Unfortunately, there are no easy ways to switch over to the latest & greatest icloud platform.  it's a really nice platform, kind of easy to use , but you are going to have to "unlearn" some of the things you know and get used to the new tools.  New platform is also very mobile friendly already (no having to build a mobile site with that lame Duda)  What I did was to create a NEW site.  You can name it similarly to your old site because the homestead name is  blahblah.icloud.   Then I opened my older site in a separate window (not in editing because you apparently can't have 2 homestead editors open at the same time) and then I just literally copied and pasted all the text, page by page, to the new site, then I went back to icloud editor and started making it look beautiful. For your images and stuff, i THINK you can download your files back to yourself from File Manager.  I had all mine sitting in a folder already, so I didn't have to do that.  I have to do another "switchover" very soon and am going to attempt the download.  Wishing you well!

You are using Sitebuilder Plus. It is not the newest platform. To use it, you need to create a new site. Websitebuilder will be used on a new site.

What issue are you having? Sitebuilder Plus should not have any link problems.