Migration Assistant multiple use Is it possible to use the migration assistant to transfer files from my old PC to a new Mac (OSCatalina) more than once? I've got around 300gb of data on my old pc and transferred just 50gb to start with so that I don't have to wait for days to finish, but now when I open the migration assistant it says that the migration is "complete" and does not allow me to conduct a second transfer. 

Is there any way to do another migration?

Thanks!
Your 'get out of jail free' card would be if all you have left to transfer are some simple stand-alone documents, rather than user-specific data, email accounts, browser logins &amp; passwords etc. You could then just network the two together &amp; file-share, rather than migrate.

Each migration will set up a new user account on your new Mac.
Your current stumbling block is you would have to keep generating new names. As soon as you do, it will let you proceed - but don't do that.
Picking this apart manually afterwards is going to be an absolute nightmare.* 

Set aside sufficient time to be able to do this in one go &amp; start over. Wipe the Mac &amp; install a fresh new OS. Do the full migration as soon as it asks you, when you're initialising for first use.
You will be considerably better off in the long run.

*Been there, done that, don't ever want to do it again.

The procedure to do a full reset is at Apple KB - What to do before you sell, give away, or trade in your Mac In essence, you want to handle this as though you are going to be the 'next user'.