Hi Uri, I also had the same issue, uninstalled it for weeks before trying again....
paper size and page orientation settings
Also, er0077 has 'curent' instead of 'current'.
Since the code didnt format well, here is a patch.
Invoice number, Company Number and Payment Details on Invoice
The above didnt come out on the PDF version and after much investigating I have altered...
Ad-hoc billing cycle
As usual, I forgot something... need to add column to projects table via: alter table...