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Enhancement
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Resolution: Won't Do
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Major
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None
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1.0.4.Final
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None
When you install a plugin there should be a way to tell it to skip the install if the plugin has been installed already, or provide a command to test for the existence of a plugin.
Since we are using a completely new addon distribution mechanism in Forge 2 that addresses this problem (only snapshot addons are overwritten, other versions are upgraded and can live side-by-side), I don't think we will be fixing this issue in Forge 1.