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According to archived Cadence release notes, Hotfix 16 resolved: cadence orcad allegro 166 hotfix 16 patched
Whether you use the official version or a patched alternative, remember that the goal is to produce flawless PCB designs – not to fight software versioning. Use the information in this guide to stabilize your environment, but plan for migration. The last 16.6 design file will eventually need to open on a future OS, and when that day comes, no hotfix will save you. and when that day comes