When downloading a new engine version you are given the ability to locate the engine version any where you wish. The engine data is not that bad and does not explain by it’s self it’s chewing up you C drive space.
What will suck up storage space on an SSD drive is where the asset vault is located. By default the launcher will locate it on your C drive so all of you downloaded goodies is taking up all of your space and not the engine versions.
To solve it and as you said put stuff where you want it launch the launcher and under settings change the location of the Vault. Once done you should be able to move the vault from your C drive and delete it.
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