I'd be happy to help you with your request!

It seems like you're looking for information about FastCopy, a file copying and data transfer software. You've provided several links and details about different versions of the software.

To summarize, here are some key points:

1. There is no 'FastCopy 5.4.0' mentioned in the text. The latest version available is FastCopy Pro 5.4.3.

2. FastCopy Pro 5.4.1 is also available for download, with a file size of 4.2 Mb.

3. FastCopy Pro 5.4.0 has a file size of 4.2 Mb as well.

4. There's no mention of an 'extras' version in the provided text.

Some additional information about FastCopy:

1. FastCopy is known for its high-speed performance and efficiency.

2. It's a slim but powerful freeware file-copying utility for 64-bit Windows editions.

3. FastCopy can copy/delete unicode and over MAXPATH(260byte) pathname files, making it useful for advanced file copying needs.

You might also be interested to know that rsync is another file transfer program capable of efficient remote update via a fast differencing algorithm.

Lastly, there's no mention of Avant or medical terms in the provided text. It seems like you may have accidentally copied some unrelated information along with your request.

Let me know if I can help you with anything else!

Free download FastCopy 5.4.0