diff --git a/logic/LegacyUpdate.cpp b/logic/LegacyUpdate.cpp
index fa3fd240..60dde3e8 100644
--- a/logic/LegacyUpdate.cpp
+++ b/logic/LegacyUpdate.cpp
@@ -261,16 +261,20 @@ void LegacyUpdate::jarStart()
 	// Build a list of URLs that will need to be downloaded.
 	setStatus("Downloading new minecraft.jar");
 
-	QString urlstr("http://s3.amazonaws.com/Minecraft.Download/versions/");
-	QString intended_version_id = inst->intendedVersionId();
-	urlstr += intended_version_id + "/" + intended_version_id + ".jar";
+	QString version_id = inst->intendedVersionId();
+	QString localPath = version_id + "/" + version_id + ".jar";
+	QString urlstr = "http://s3.amazonaws.com/Minecraft.Download/versions/" + localPath;
 
-	auto dljob = new NetJob("Minecraft.jar for version " + intended_version_id);
-	dljob->addNetAction(MD5EtagDownload::make(QUrl(urlstr), inst->defaultBaseJar()));
-	legacyDownloadJob.reset(dljob);
+	auto dljob = new NetJob("Minecraft.jar for version " + version_id);
+
+
+	auto metacache = MMC->metacache();
+	auto entry = metacache->resolveEntry("versions", localPath);
+	dljob->addNetAction(CacheDownload::make(QUrl(urlstr), entry));
 	connect(dljob, SIGNAL(succeeded()), SLOT(jarFinished()));
 	connect(dljob, SIGNAL(failed()), SLOT(jarFailed()));
 	connect(dljob, SIGNAL(progress(qint64, qint64)), SIGNAL(progress(qint64, qint64)));
+	legacyDownloadJob.reset(dljob);
 	legacyDownloadJob->start();
 }
 
@@ -482,4 +486,4 @@ void LegacyUpdate::ModTheJar()
 	// inst->UpdateVersion(true);
 	emitSucceeded();
 	return;
-}
\ No newline at end of file
+}
diff --git a/logic/OneSixUpdate.cpp b/logic/OneSixUpdate.cpp
index feaba6a5..44314e1e 100644
--- a/logic/OneSixUpdate.cpp
+++ b/logic/OneSixUpdate.cpp
@@ -290,17 +290,22 @@ void OneSixUpdate::jarlibStart()
 		return;
 	}
 
+	// Build a list of URLs that will need to be downloaded.
 	std::shared_ptr<OneSixVersion> version = inst->getFullVersion();
+	// minecraft.jar for this version
+	{
+		QString version_id = version->id;
+		QString localPath = version_id + "/" + version_id + ".jar";
+		QString urlstr = "http://s3.amazonaws.com/Minecraft.Download/versions/" + localPath;
 
-	// download the right jar, save it in versions/$version/$version.jar
-	QString urlstr("http://s3.amazonaws.com/Minecraft.Download/versions/");
-	urlstr += version->id + "/" + version->id + ".jar";
-	QString targetstr("versions/");
-	targetstr += version->id + "/" + version->id + ".jar";
+		auto job = new NetJob("Libraries for instance " + inst->name());
 
-	auto job = new NetJob("Libraries for instance " + inst->name());
-	job->addNetAction(MD5EtagDownload::make(QUrl(urlstr), targetstr));
-	jarlibDownloadJob.reset(job);
+		auto metacache = MMC->metacache();
+		auto entry = metacache->resolveEntry("versions", localPath);
+		job->addNetAction(CacheDownload::make(QUrl(urlstr), entry));
+
+		jarlibDownloadJob.reset(job);
+	}
 
 	auto libs = version->getActiveNativeLibs();
 	libs.append(version->getActiveNormalLibs());