Hi Accounts Offroad ,

Thanks for reaching out on the Sage Community Hub!

The quickest route for this one will be our Sage Support team via webchat, since they'll be able to look into your account directly. You can access webchat here: [Link]. They operate within standard business hours and typically respond within a few minutes during busy periods.

Once things are resolved, feel free to come back and share the outcome so other members can benefit.

Kind Regards,
William | 

Hi Accounts Offroad,

The following aerticle contains steps to solve the error message:

• ERROR: 'Invalid Class String' when accessing the payroll

Thank you everyone for your responses.

I've managed to download the full system backup from June 2018 onto another pc, where I was able to restore the program with the data.  After I've extracted the report I required from that data set, I've restored the data for November 2017, and extracted the report I required.

Thus all done and dusted.