At the bottom of every bundle, there is a “Included Items” section with all individual parts (like the right arm, etc.). Click on each of them, and on each of their pages, you should see a download icon:
If not, maybe I have it due to an extension (I have BTR and Roblox+), so you get can those if needed. The download is essentially an RBXM file, basically the objects.
Go to studio, right click on workspace, and click Insert From File. Select the RBXM files and it will insert the configuration of the body part (like the meshpart with the texture and the attachments, too).