well, first off the latest version of wine in branch 4 works fine with guild wars, so you can just use that one.
As a second bit, for your download concerns, we provide md5sums with our images so that you can check to make sure the iso you downloaded is the one we uploaded, and not just a small part of it. Always make sure your burning program checks the md5sum to make sure you've got a valid iso image before burning it.
And as a final note,
equo upgrade 5
will actually upgrade you to branch 5 goodness, without actually downloading the DVD at all!