Broken links between instances and library

Hi and help!
As a designer, I start to work on an old project. The client give me access to 2 files : one with the wireframes and one with the components (library).
Those files were exported to a local copy by the previous designer, then imported in a free plan by the client, so the links between them are broken 😫.
I download the files as a local copy and import them in my paid plan, but I don’t know how to relink the instances to the library. 

What can I do ?