If they are still on a lower build then they were not updated to the latest build. The hotfix should update all of them.
If all else fails, try this:
1. Unintall ARCHICAD and all Goodies.
2. Install ARCHICAD build 3006.
3. Install all Goodies.
4. Apply hotfix which should update AC and all Goodies to the latest build.
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2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27