We need a function to download all invoices. The only way to do it currently is to download customer by customer. We have 1500 customers and doing this would be immensely time consuming. We joined Kashflow when it first started and the big selling point was being able to easily download all your data. It seems like this is now extremely difficult.
With Kashflow's use of DRopBox behind the scenes - I think this is now solved: just access the DropBox account you attached to KF.
The setup instructions - https://www.kashflow.com/support/kb/using-dropbox-kashflow/