The package is straight from Gumroad.

Includes:
Avatar Dynamics
Contacts: Head pat with heart particles and nose boop
Props: Umbrella, Lollipop, Bubblegum
Physbones
Toggles
All Clothing and Accessories
Tattoo Toggle
Darker Skin Toggle
Hue Shifts for hair, nails, eyes
Body Blendshapes (prevents clipping)
Custom Face Emotes
VRLabs Marker
Leira's Avatar Contacts:
Head Pat - Emits heart particles and happy face when patted
Nose Boop - Creates a silly face when nose booped
Lollipop - Licks the lollipop when put by the mouth

Umbrella - Hold either in left or right hand.
- Open umbrella by pressing the button near the handle of the umbrella
- Close umbrella by pressing the button near the tip of the umbrella

Bubblegum - Blows a bubblegum that pops. Switch the mode to allow yourself or others to pop it.

NOTE: Everything is included in the folder. Just follow the instructions.

INSTRUCTIONS:
1. Create a new unity project (2019.4.31f1)
2. Import Poiyomi Shader
3. Import VRCSDK3
4. Import Leira Package
5. In Unity, go to Assets>!Leira, and double click the Leira Unity Scene.
6. Open VRChat SDK and upload!