When installing Sage 50 Accounts, the following message can appear:

'Error 1609: An error has occurred while applying security settings. Users is not a valid user or group. This could be a problem with the package or a problem connecting to a domain controller on the network. Check your network connection and click retry or cancel to end install.'

This message usually appears when you use a non-English Windows version, so the system cannot find a group named Users.

To resolve this, you must create a new Windows group called Users. For help with this, contact your IT administrator or visit the Microsoft support site at https://support.microsoft.com.