Hello there, RodenA.
I'll make sure to provide a few details about opening a file from QB ProPlus to QB Enterprise.
When it comes to opening company files, they need to be opened in the same version as the one the company file originated from. Since you're using QuickBooks Enterprise and your client is using QB Pro Plus, the option to open the file in your version isn't available. Also, you'd need to get a copy of QB Pro Plus in order to do it.
In your free time, you can read through these articles for more tips and details:
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