Make sure that the product is not disabled (line through its name), then check that vBulletin Options>Plugin/Hook System>Enable Plugin/Hook System is set to yes, then go to Plugin System>Plugin Manager, and make sure that there are 4 Activity Modification and 1 Activity Modification Maintenance plugins and that all are checked under active. If you earlier tried to install this mod through the Plugin Manager page, make sure that there is not a remaining corrupted plugin.
If you've checked all of those and they appear to be correct, you could try uninstalling and reinstalling the product.
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