be483f5a61fd3b6ea47aad4c68948e1263855071
already installed. If we don't get rid of the old theme, we'll have junk files accumulating that cause major problems. Keep track of what "packages" are included in an SMZIP, and offer to remove them when the SMZIP is installed. Don't derive it at extraction time; this way, we can still create "overlay" SMZIPs. Make sure we don't do anything stupid if something malicious like "..\..\.." is listed as a package name.
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2%