The general solution to this problem is trac #4951, the activity updater, which I've landed recently. Trac #7495 says that the first boot after an upgrade should open the activity updater, so that a version of the activity compatible with the new OS can be installed if necessary. The activity update protocol understands simple base OS dependencies, so that you can specify a different version for 8.1 and 8.2 (for example). The [[Activity_bundles]] wiki page documents the update_url tag. --scott
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