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Automatic Installation:
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​Locate the downloaded .mcaddon file.
​Double-click or tap the file.
​Minecraft will open automatically and begin importing the Behavior Pack and Resource Pack.
​Wait for the "Import Successful" message at the top of your screen.

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Manual Installation:
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​Rename the file extension from .mcaddon to .zip.
​Extract the folders.

FOR PC USERS:
​Move the Behavior Pack folder to:
AppData > Roaming > Minecraft Bedrock > Users > Shared > games > com.mojang > behavior_packs
​Move the Resource Pack folder to:
AppData > Roaming > Minecraft Bedrock > Users > Shared > games > com.mojang > resource_packs

FOR ANDROID USERS:
​Move the Behavior Pack folder to:
Android > com.mojang.minecraftpe > files > games > com.mojang > behavior_packs
​Move the Resource Pack folder to:
Android > com.mojang.minecraftpe > files > games > com.mojang > resource_packs

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How to apply to your world:
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​Open Minecraft and go to Play.
​Create a New World or click the Edit button on an existing world.
​Scroll down on the left sidebar to Resource Packs.
​Click Owned, select Extensive Mob Heads RP, and click Activate.
​If you activate the Resource Pack, the Behavior Pack should have activated by itself as well.
In case it hasn't, scroll down to Behavior Packs.
​Click Available, select Extensive Mob Heads BP, and click Activate.

​IMPORTANT: This addon does NOT require any "Experimental Gameplay" toggles. You can play right away!
​Click Create or Play.