Use Path for Downloader.

Change-Id: I820bc2d5c480a51f4de211bfa38a9a56592f399d
Reviewed-on: http://gerrit.dmdirc.com/4054
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

src/com/dmdirc/updater/retrieving/DownloadRetrievalStrategy.java

 import com.dmdirc.util.collections.ListenerList;
 import com.dmdirc.util.io.DownloadListener;
 import com.dmdirc.util.io.Downloader;
+import org.slf4j.LoggerFactory;
 
+import javax.inject.Inject;
 import java.io.File;
 import java.io.IOException;
-
-import javax.inject.Inject;
-
-import org.slf4j.LoggerFactory;
+import java.nio.file.Paths;
 
 /**
  * An {@link UpdateRetrievalStrategy} that downloads a file specified in a
                     .retrievalProgressChanged(checkResult.getComponent(), 0);
 
             LOG.debug("Downloading file from {} to {}", checkResult.getUrl(), file);
-            downloader.downloadPage(checkResult.getUrl().toString(), file,
+            downloader.downloadPage(checkResult.getUrl().toString(), Paths.get(file),
                     new DownloadProgressListener(checkResult.getComponent()));
 
             listenerList.getCallable(UpdateRetrievalListener.class)