It turns out that they used to use
<project_update>\a<project_url>\ahttp://a.b.c/d/</project_url>\a</project_update>\a

and now they want
<project_update>\n<project_url>\nhttp://a.b.c/d/</project_url>\n</project_update>

If they were using actual XML, they would be expecting
<project_update><project_url>http://a.b.c/d/</project_url></project_update>

and if they wanted better performance and to use less bandwidth, they would use
<project action="update" url="http://a.b.c/d/"/>

Anyway, here's a new version that works with 7.0.3:
http://boinc.thesonntags.com/collatz...ater_v1030.zip