Yes, sometimes this is what you have to do:
1. Uninstall Java 8.
2. Install Java 7 from the installation DVD (or whichever version comes on the DVD).
3. Install ARCHICAD.
4. Update to Java 8.
This is nobody's fault really (although Java 8 could be compatible with Java 7 - however sometimes in software development to implement certain improvements compatibility with previous versions must be abandoned).
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