First 3 packages are custom packages developed by your organization so you should have the nuget package of these packages to install in your project.
For remaining packages, you should be able to install the package from official feed.
I would advise to no to upgrade the project from Legacy to Windows before you check the compatibility of the first 3 packages with Windows compatibility.
If you convert the project to Windows and your packages are on Legacy, your project won’t work.
Thanks,
Ashok 