Sage Accounts 50 not allowing further addition of existing companies to new PC with New 24.2 install

SUGGESTED

Hi.

I have a new Windows 10 PC for our accounts team to try out before upgrading everyone and I've installed Sage Accounts 50 v24 and upgraded to V24.2.

Sage has allowed me to add 9 of the 25 companies, and then refuses to add the rest. Even though it can see and read the data, when clicking "continue" it just returns to the company file menu.

All the existing PC's with Sage Accounts 50 v24.2 as is the PC with the shared drive as a data source. All of these PC's are fine.

All of the company data has been upgraded to V24 and functions correctly on every other Sage Accounts 50 Install

What do I need to change or update further?