Hi, Due to significant errors of your software we were forced to change it. I want to download all the invoices (at once) from QB to our archives. How can I do that?

Hi adrian-showcentr, thanks for joining the Community. 

It isn't great to hear you've been experiencing issues with QuickBooks. To download invoices to your computer in one file, navigate to Sales > Invoices > Set the status drop-down to 'All > Select the relevant tax year > Click the check-box to the left of the date heading to batch-select all > Batch actions > Print. 

From the print preview window that opens, select the downwards arrow to download.