Go to File > Import > FBX . Ensure you select "Automatic Bone Orientation" to keep the rig from looking like a pretzel.

The Esra model is a popular digital asset typically distributed in a .7z (7-Zip) format to maintain high compression without losing data. Depending on the version you’ve found, this archive usually contains: The core 3D geometry.

Import the extracted folder into your Project window. If the textures appear pink, you’ll need to re-assign the shaders (Poiyomi or standard Unity shaders are the usual go-tos for Esra).