"Click here to get the Download File H2 xrd TO SILK.bin."

"I have already saved the Download File H2 xrd TO SILK.bin to my desktop."

When referring to a specific file name or a distinct action like a download link, "the" is the standard definite article used to identify that unique item.

"I need to find a download file for the H2 XRD update." (Note: In this case, you are describing the type of file rather than using the literal name).

If you are referring to the action or the file as a general object in a sentence, here is how you would use it:

The proper article to use before is "the."