It depends on where the freebie is made available. If it is in the Marketplace or Backstage then it will be installed in the correct folder, along with any and all assets supplied with it. If however the freebie is being offered for download by a Forum user, either in a ZIP file or as an I-whatever then you will need to copy it in to the correct folder yourself.
Since all iClone files have endings such as iProp, iTree, iMotion, iCharacter and so on you just need to put it in one of your Custom folders containing files with similar endings.
System: Win 10 Pro (20H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-461.72), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.