I have couple programs aquarium freehand paid. Do I need to keep the free programs in order to use the paid Apps?
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Usually the developer specifies when you need to keep the free portion installed when you buy the license.
If you are worried, deleting the free portion to see if it still works is a win since you can always re-download the free app.
Depends on how licensing is handled but, as AngryHatter said, it really depends on the app. Some apps actually have one version for free and paid and just the license is a separate paid app. Some apps have entirely separate paid and free versions that have nothing to do with each other. Read up on the app or ask the developer.