How to import old .dwg file into prosteel connect?

Hi, I tried importing a .dwg file created in prosteel (they didn't say which version). The file imports, but doesn't have any shapes.

I looked at

https://communities.bentley.com/products/prostructures/w/structural_drafting_and_detailing__wiki/37094/how-to-migrate-prostructure-v8i-older-select-series-to-prostructures-connect-for-autocad

and

https://communities.bentley.com/products/prostructures/f/prosteel-forum/225422/import-prosteel-for-autocad-in-prosteel-connect-edition

It says there should be a key-in for the ProStructures Migration Assistant that you start with "prostructure migrate", but typing that doesn't work.

Do I need to download some program for this to work or?

Thanks in advance