Draftsight won't open. Can't obtain license. Contact Tech Support...

As of this morning. Draftsight won't open. Message says: Can't obtain license. Contact Tech Support. Purchased this in May 2025 so license is still good. Worked fine last week. Standalone install. Contacted, via email as it's only a Professional license. I've heard nothing from tech support. Dassault...do better!

Any advice as their tech support is basically non-existent?