How is the Uplink Corporation catching me [ARC path]?

Solution 1:

What did you get disavowed for?

I'm guessing you most likely got disavowed for doing the ARC path, since when you do it you get disavowed, which may be the reason.

If it said you got disavowed for hacking into an organization, it would say which, and in that case, you did not get disavowed for the ARC play-through, but you got disavowed for well... hacking into an organization.