If you want to upgrade, you just install the new one, in the same location you have the old one. (no uninstall needed)
If you have additional packages installed, just rebuild the IDE once after the first start.
But even if you do an uninstall, this will keep your user settings.
In 99.99% of all cases that is fine.
In extremely rare cases, the old preferences you had may not work. If that is the case, install again, and in the insatller choose the checkbox to clear user config.
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If you want to keep the old, and have 2 independent installs, that is ok too. The installer has an option for that.