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Just go ahead and install 2.2 as it will install over previous versions. You do not need to uninstall 2.1.1.
I just installed 2.2.2 over 2.2.1, and I still have C:\Users\<user>\Documents\WICED\WICED-Smart-SDK-2.2.1, which is over 500Mb in size. Deleting it breaks Eclipse settings, so the best way to avoid having the extra half gigabyte of stuff I've figured out is to delete the folders below and install from scratch. I do recommend that you save your own code before you do delete everything
You are right. Thanks for the highlight...