The Day of Dragons add-on will turn you into a 4D Dragon model with cool animations. This one is like a dragon simulator that allows you to become a cool dragon. This addon is actually a texture pack with a skin pack to change your skin to the right Dragon texture.
There are three skins of the Dragon. The first one is Night Fury, the second one is Aether Dragon, and the third one is Black Dragon. Dragon Night Fury is from How to Train Your Dragon addon created by Yasser Twitter @StarkTMA_YT. This one has a custom flying animation and custom walking animation with pretty rotate animation.
The Dragon 2 The Aether Dragon is from Mountains++. This one is a small but it has the custom wings animation just like the first one. Keep in mind that it is only model that has a saddle and also has the texture.
The Dragon 3 Black Dragon is from Dragon addon created by zahf Gaming Youtube channel zahf Gaming. This one is so epic. It has custom flying, walking and rotating animation and it is so big.
How to change your model and skin? If you want to change your model and skin, the first thing that you have to do is to activate the texture pack. Then, change it using the Resolution. The next thing that you have to do is to change your player skin by using the skin pack from the addon. Do not forget to make sure you use the right skin. Before anything, please do not use this texture pack on any servers because the other players look so weird.
There are two methods to install addons. Some of them download as a .mcworlds or .mcpack. If you want to install it, you have to download the Download folder. You can just double click on the file and it will automatically be imported to your game. It might ask you to choose an app to open it with. You can just choose to open it with any versions of Minecraft.
If you download a .zip or .rar file then you can start by browsing the addon (in this case 4d Dragon) section and find one which you want to download. Then, download the file that usually includes a .zip or .rar file. It is a compressed one which you have to extract using a program such as 7 Zip or WinRar. You are recommended to use 7 Zip as it is completely free and is really easy to use. Next, find the zip file on the computer. Choose both folders and click Extract. Choose the location here you want to extract the folders. Open Downloads folder or wherever you selected to extract the folders. Once you copied the folder, go to the location using File Explorer. Open up the Downloads folder again and find the 4d Dragon folder. Open the com.mojang folder and open resource_packs folder. Then, paste the folder here. In the end, start Minecraft and you will be able to see the result.