Hey there, @SandyP.

Thanks for following the thread. 

To clarify, how is your file shared? Is it on a local drive, such as the C: drive? Or is the file shared through a virtual server? 

If the file is shared locally, it will depend on which computer holds the file. For example, if your assistant's computer holds the file and she took her laptop, you will need to get the file from her computer. However, if the file is on a local server or your computer, you can still access it. I recommend reaching out to your IT professional. This way, they can track down your company file and reset the sharing folder. 

I've included the link to install QuickBooks below. I've also included a link that explains file sharing. 

How to install QuickBooks

What to do if you can't open your company file

I look forward to your reply and getting this resolved with you every step of the way. Let me know if you have further questions or concerns. You can reach out to the Community at any time. Take care!