Although it’s not labeled as such, Word Press 3.7 has effectively acted as a LTS version or Long-term support.
Security updates and crucial bug fixes have been ported back to previous branches up to 3.7.
Give a try with changing it to a windows user with enough build permission.
Moreover, please make sure you have a workspace mapping for your build computer and for the windows account under which build agent runs.
According to version statistics on Word Press.org, 0.4% of tracked sites are using Word Press 3.7.
With a single Subversion command, you can check out the repository (or restore an existing working copy) exactly as it was at any date or revision number in the past.
However, sometimes you just want to before—it displays file differences in unified diff format; we used it to show the local modifications made to our working copy before committing to the repository.
Tracked files are files that were in the last snapshot; they can be unmodified, modified, or staged.
Untracked files are everything else – any files in your working directory that were not in your last snapshot and are not in your staging area.