I cannot get may Solar Accounts 3 package to open on may mac since installing the new operating system. My online Solar Accounts is ok but not my old one.

Hi John,

I'm afraid that the latest version of MacOC cannot run 32-bit software, and
we don't have any plans to provide an update to the offline version of
Solar Accounts. Your best approach is to make a backup of all your data
then perform a 'factory reset' on your computer to revert to a previous
version of MacOS (please contact Apple for details of how to do this), then
re-install the offline version of Solar Accounts from our website
<https://www.solaraccounts.co.uk/download?online=false>.

Many thanks Mark, no worries.