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Background
When a user tries to install mods that conflict with one another or with an installed mod, the apply changes button is disabled and a description of the conflict appears in the leftward part of the status bar.
Motivation
It has been fairly common recently for users to ask why the apply changes button is disabled; many or most users don't notice the text in the lower left until it's pointed out.
Changes
Now when the changeset has conflicts, you can still click the apply changes button, but the conflicting mods are highlighted in red in the changeset, the conflict reasons take over the description column, and the apply button is disabled:
Hopefully this will make it more discoverable.