All you should need to do is copy and paste the ftp link into the windows explorer Address window and click enter. Note that is windows explorer 'not' internet explorer.
If you are trying to use the link you pasted in Reply #52 is it is a mishmash of an http and ftp address, copy and paste this ftp://ftp.avast.com/incoming into windows explorer and click enter.
It will give an FTP Folder error, don't worry, just click the OK button, you will now have a blank right half to the window (that is the avast ftp incoming folder.
Now open another windows explorer window, navigate to where the dump file is and drag it into the blank right half of the other explorer window.