maybe build deletes the downloaded archive?

sonarqube.xml

@@ -10,7 +10,7 @@
   <property name="downloads" location="build/downloads"/>
   <property name="sonarqube-ant-task-jar" location="${downloads}/sonarqube-ant-task.jar"/>
   <property name="sonarqube-ant-task-url"
-            value="https://binaries.sonarsource.com/Distribution/sonarqube-ant-task/sonarqube-ant-task-2.5.jar"/>
+            value="https://binaries.sonarsource.com/Distribution/sonarqube-ant-task/sonarqube-ant-task-2.6.0.1426.jar"/>
 
   <target name="download">
     <mkdir dir="${downloads}"/>
@@ -23,7 +23,7 @@
     </ant>
   </target>
 
-  <target name="sonar" depends="download,build-classes">
+  <target name="sonar" depends="build-classes,download">
     <taskdef uri="antlib:org.sonar.ant" resource="org/sonar/ant/antlib.xml">
         <classpath path="${sonarqube-ant-task-jar}" />
     </taskdef>