PDF Embedder Unexpected server response (204) while retrieving

After installing PDF Embedder plugin on WordPress web, then insert a PDF file into a post, then encountering an error “Unexpected server response (204) while retrieving”.

How to solve the error of PDF Embedder about “Unexpected server response (204) while retrieving”?

There are many users encountered the problem:

Unexpected server response (204) while retrieving PDF
in my local host it working perfectly but when I am using on my website it’s giving me such type of error.

This error of PDF Embedder is often due to the use of one Download Manager software in your browser, such as Internet Download Manager (IDM). (Free download Internet Download)

So, try in a different browser to check, or disable the Internet Download Manager… the problem “Unexpected server response (204) while retrieving” will be solved.