So I managed to get the Boshy source code that I decompiled a few years ago to fully load without any missing frames!

Here's how I did it:

So first you need Clickteam Fusion, MMF2 might work, depends on what the game was last compiled on which I believe was Clickteam Fusion, the games development was started in MMF2 however.

I'm using Clickteam Fusion Developer 2.5+ (Build R293.10) any version probably works fine though as long as it's not super super old, I'm not 100% sure though xD.

The reason why it never loads properly is because of missing extensions, so I'm going to list all the extensions you need how to get them.

In the Fusion UI, hover the cursor over "View" at the top and click on "Extension Manager" and than click on the search bar and search and install all these extensions:

(All of these or some might already be installed, I'm not sure but check anyways)

Color Selector

Control X object

Fast Loop Object

File-Folder object

ForEach

Key Object

Lacewing Relay Client

Mouse Object

Open URLs Object

Parallaxer

Perspective Object

Popup Message Object 2

Random Pool

String Parser

Text Blitter

Timer Object

Viewport

Yaso object

That's all the extensions that you can install straight from the extension manager, but there are still some other extensions that must be installed manually, follow these instructions exactly:

Unzip the downloaded file below and open the folder named "Extension Files" and drag all the contents into "C:\Program Files (x86)\Clickteam Fusion Developer 2.5"

Next, Open the folder named "Extension Installers" and double click on "Overlay Redux.exe" and proceed by installing it.

Download it all here:

https://www.mediafire.com/file/fnxm0vacd2ehtrc/Boshy_Source_Code_Missing_Extensions_%2526_FX.zip/file

If you don't already have it then download the Boshy source code from:

https://www.mediafire.com/file/czocextus1mj1m4/Boshy_Source_Code.zip/file

Here's a list of all the extensions used by the game: https://imgur.com/a/NZojt7J

Hopefully some cool stuff comes from this.

Enjoy everyone! I'm glad I was able to finally get this going for everyone :D