[Image Library] Starting order StackModifier 

Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: skylantern_0 - Image URL: https://www.rustedit.io/images/imagelibrary/skylantern.png 

Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: skylantern.skylantern.green_0 - Image URL: https://www.rustedit.io/images/imagelibrary/skylantern.skylantern.green.png 

Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: skylantern.skylantern.orange_0 - Image URL: https://www.rustedit.io/images/imagelibrary/skylantern.skylantern.orange.png 

Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: skylantern.skylantern.purple_0 - Image URL: https://www.rustedit.io/images/imagelibrary/skylantern.skylantern.purple.png 

Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: skylantern.skylantern.red_0 - Image URL: https://www.rustedit.io/images/imagelibrary/skylantern.skylantern.red.png 

Image failed to download! Error: HTTP/1.1 404 Not Found - Image Name: hat.tigermask_0 - Image URL: https://www.rustedit.io/images/imagelibrary/hat.tigermask.png 

Image batch (StackModifier) has been stored successfully 

[Image Library] Starting order StackModifier 

Image batch (StackModifier) has been stored successfully 

Again this has nothing to do with stack modifier. 

That is clearly saying 404 Not Found which means Image Library requires updating for its Image Links.

( StackModifier has never provided any such links all of that is exclusively done through the Image Library plugin. )

As I had clearly stated on the update notes already about it.