I need to access a SVN repository that is available online but unfortunately, I am behind a firewall that will not allow svn checkout ...
etc. Is there a service that I could give the repository URL, it would download the files for me and provide a ZIP file or something?
Related question: Download an SVN repository? However, the answers are not helpful for my case (I absolutely cannot use a local SVN client).
Since http://svndownload.eu5.org/ does not seem to work any longer, I suggest using wget
as explained in an answer to the question you linked to.
If you are on a Windows machine and need wget
I can recommend GOW (Gnu On Windows) as a lightweight collection of unix commands for windows.