Not sure what you mean by the term 2018 upgrade. Did you arrange a "download only" UltraPak, or the PlusPak?

The total size is a little over 100GB (as I remember), but there is a lot of commonality between the 2016 files and the 2018 files, so it's not a matter of adding the two sizes together.

Assuming the complete download version (that will show up in your account), just download all the files. Then copy your BB folder from your hard drive to the external USB drive (again, don't forget the RealTracks and RealDrums folders). Then just run all the installation files that you downloaded and specify the location of your external drive. Since BIAB 2018 uses a new folder structure, initially, you will need a little additional space, but then make sure you run the "cleanup" routine once you are done.


John

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