Dear Daniel And Q,
You make a great work. Thank you very much.
I have just upgraded from 1.4.7 to 1.0.5. Seems working fine.
In 1.4.7 was the great function Generate invoice. This is very important.
In version 1.5.x this is missed. Invoice prefix do not printing... why?
And when I upgrade to 1.5.x Invoices start from the first number (1) Prefix i leave the same.
Where I can edit invoice number?
Can you add in admin panel some settings For example: Generate invoice automatically or Generate invoice manually?

And another one thing... where I can edit Store URL? (This is not very important)
Custom OpenCart modules and solutions. You can write PM with additional questions... Extensions you can find here