LEGO Dimensions PC installation tutorial

Unzip all the game's files
Go here, and download the .ird file of BLES02105 if you have the EUR version, or BLUS31473 if you have the USA version
Download PS3 ISO Patcher
Open test_patcher.exe, and select the Base Game's .iso file and the recently downloaded .ird file, and press Patch
Download 3K3Y IsoTools
Open IsoTools.exe, click on ISO Crypto, and select the previously patched .iso file
Extract the newly created .dec.iso file, name the extracted folder BLES02105 if you have the EUR version, or BLUS31473 if you have the USA version, and put it where you would like to store your games
Open RPCS3, File -> Add Games, and select the folder where you put the extracted folder
File -> Install Packages/Raps/Edats, and install the update and all DLCs

Virtual machine

Option A:
Follow the steps here
You can download Virtualbox here (which I use, and it works)
You can download VirtualHere here

Option B:
Alternatively, you can use the built-in toypad inside RPCS3 itself.

And you can finally play LEGO Dimensions on PC!

Cemu

Full tutorial in video format

Video

Written tutorial

Get the base game

Option A: Dump it from your own Wii U console. You can find how to do so here

Option B: Download it below, depending on which region's version you want (there are mostly only language differences between the two versions)

Base Game (EUR)
OR
Base Game (USA)

If you've downloaded it from Option B, you'll have to do the following:
Download Java if you haven't already.
Download JWUDTool.
Extract the base game with a tool such as 7zip, and then place the .wux file to the same folder as JWUDTool, and run the following command:
EUR version: java -jar JWUDTool-0.4.jar -in "LEGO Dimensions (Europe) (En,Fr,De,Nl,Da) (Rev 1).wux" -commonkey D7B00402659BA2ABD2CB0DB27FA2B656 -titleKey 6BC50D8F3BB532629DB4BD6CDE02452E -decrypt -out LD
OR
USA version: java -jar JWUDTool-0.4.jar -in "LEGO Dimensions (USA) (En,Fr,Es).wux" -commonkey D7B00402659BA2ABD2CB0DB27FA2B656 -titleKey 6CB5D1F92650122AB7631321781482DB -decrypt -out LD
And then, you'll have your files in a folder called LD.

Get the Update and DLCs

Download WiiUDownloader
Search for the 4 DLCs and the Update of the game in the app, of course select the Europe versions if you downloaded the EUR base game, or the USA versions if you downloaded the USA base game. Make sure that Decrypt contents and Delete encrypted contents after decryption are both checked at the bottom. If everything's correct, click Download queue.

Download Cemu
Once you've downloaded it, unzip it, open Cemu.exe, and read through what pops up when first opened. These settings are not necessary to set now, you can set them anytime later.
Now, install the game, update and DLCs.
File -> Install game, update or DLC, and select the meta.xml files of each DLC, the Patch and the Game.
The DLCs won't work by just doing this, you'll have to manually move them:

Go into Cemu's main folder
Inside that, go into mlc01, and then usr and then title and then 0005000c folder. Here, you should have 4 folders. Go inside the ones named 10195d01, 10195d02 and 10195d03, and go inside their respective content folders, and move everything out of the content folder inside 10195d00 folder's content folder.

Congratulations! You've successfully installed the game. Now, you just have to set it up to work actually.

Option A:
Follow the steps here
You can download Virtualbox here (which I use, and it works)
You can download VirtualHere here

Option B:
Alternatively, you can use the built-in toypad inside Cemu itself.

And you can finally play LEGO Dimensions on PC!

PS4 link - for modding purposes

This is a .torrent file, you'll need qBitTorrent to be able to download it.

Main game + update + DLCs

There is a direct download option on Web Archive as well:
LEGO Dimensions PS4 (EUR) (DLCs)
LEGO Dimensions PS4 (EUR) (Main game + update) (Thanks to legoman0937 on Discord for this!)

LEGO Dimensions PC installation tutorial

RPCS3

Full tutorial in video format

Written tutorial

Getting the game

Getting the emulator

Installing the game

Virtual machine

Cemu

Full tutorial in video format

Written tutorial

Get the base game

Get the Update and DLCs

Getting the emulator and related software

PS4 link - for modding purposes