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The only dependency is on GreenSock's core. There are no dependencies on jQuery or any other libraries, although they work great together.
LoaderMax is included in the main AS3 GreenSock download zip.
No need to worry. Tweens and timelines are automatically made eligible for garbage collection (gc) when appropriate (typically when they finish but if you maintain a reference to an instance so that you can restart it later, for example, it won’t be gc’d out from under you). Basically the system manages gc for you and generally cleans up after itself.
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