Assume you mean Start 2012. Start runs by year numbers while Pro runs on version numbers. Did you install with the key UNplugged - and not plug it in until after rebooting?
If you re-installed the Codemeter driver, is it this one:
http://www.graphisoft.com/support/archicad/downloads/WIBU.html
AC 28 USA and earlier • macOS Sequoia 15.3, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
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