diff --git a/logic/java/JavaChecker.cpp b/logic/java/JavaChecker.cpp
index dfda464f..54d552a9 100644
--- a/logic/java/JavaChecker.cpp
+++ b/logic/java/JavaChecker.cpp
@@ -4,7 +4,6 @@
 #include <QFile>
 #include <QProcess>
 #include <QMap>
-#include <QTemporaryFile>
 #include <QCoreApplication>
 #include <QDebug>
 
diff --git a/logic/minecraft/forge/ForgeXzDownload.cpp b/logic/minecraft/forge/ForgeXzDownload.cpp
index 2a47bb26..adf96552 100644
--- a/logic/minecraft/forge/ForgeXzDownload.cpp
+++ b/logic/minecraft/forge/ForgeXzDownload.cpp
@@ -143,6 +143,7 @@ void ForgeXzDownload::downloadReadyRead()
 #include "xz.h"
 #include "unpack200.h"
 #include <stdexcept>
+#include <unistd.h>
 
 const size_t buffer_size = 8196;
 
@@ -275,7 +276,14 @@ void ForgeXzDownload::decompressAndInstall()
 		failAndTryNextMirror();
 		return;
 	}
-	FILE * file_in = fdopen(handle_in,"r");
+	int handle_in_dup = dup (handle_in);
+	if(handle_in_dup == -1)
+	{
+		qCritical() << "Error reopening " << pack200_file.fileName();
+		failAndTryNextMirror();
+		return;
+	}
+	FILE *file_in = fdopen (handle_in_dup, "rb");
 	if(!file_in)
 	{
 		qCritical() << "Error reopening " << pack200_file.fileName();
@@ -296,7 +304,14 @@ void ForgeXzDownload::decompressAndInstall()
 		failAndTryNextMirror();
 		return;
 	}
-	FILE * file_out = fdopen(handle_out,"w");
+	int handle_out_dup = dup (handle_out);
+	if(handle_out_dup == -1)
+	{
+		qCritical() << "Error reopening " << qfile_out.fileName();
+		failAndTryNextMirror();
+		return;
+	}
+	FILE *file_out = fdopen (handle_out_dup, "wb");
 	if(!file_out)
 	{
 		qCritical() << "Error opening " << qfile_out.fileName();
@@ -305,6 +320,7 @@ void ForgeXzDownload::decompressAndInstall()
 	}
 	try
 	{
+		// NOTE: this takes ownership of both FILE pointers. That's why we duplicate them above.
 		unpack_200(file_in, file_out);
 	}
 	catch (std::runtime_error &err)
diff --git a/logic/net/CacheDownload.cpp b/logic/net/CacheDownload.cpp
index d79feb14..1ac55180 100644
--- a/logic/net/CacheDownload.cpp
+++ b/logic/net/CacheDownload.cpp
@@ -182,8 +182,11 @@ void CacheDownload::downloadReadyRead()
 	{
 		qCritical() << "Failed writing into " + m_target_path;
 		m_status = Job_Failed;
-		m_reply->abort();
+		m_output_file->cancelWriting();
+		m_output_file.reset();
 		emit failed(m_index_within_job);
+		wroteAnyData = false;
+		return;
 	}
 	wroteAnyData = true;
 }
diff --git a/logic/net/HttpMetaCache.cpp b/logic/net/HttpMetaCache.cpp
index 68bfa89c..ea3e2834 100644
--- a/logic/net/HttpMetaCache.cpp
+++ b/logic/net/HttpMetaCache.cpp
@@ -19,7 +19,6 @@
 
 #include <QFileInfo>
 #include <QFile>
-#include <QTemporaryFile>
 #include <QDateTime>
 #include <QCryptographicHash>
 
diff --git a/logic/net/NetAction.h b/logic/net/NetAction.h
index 1d7eb94b..3c395605 100644
--- a/logic/net/NetAction.h
+++ b/logic/net/NetAction.h
@@ -32,7 +32,7 @@ enum JobStatus
 };
 
 typedef std::shared_ptr<class NetAction> NetActionPtr;
-class MULTIMC_LOGIC_EXPORT NetAction : public QObject, public std::enable_shared_from_this<NetAction>
+class MULTIMC_LOGIC_EXPORT NetAction : public QObject
 {
 	Q_OBJECT
 protected:
@@ -54,10 +54,6 @@ public:
 	{
 		return m_failures;
 	}
-	NetActionPtr getSharedPtr()
-	{
-		return shared_from_this();
-	}
 
 public:
 	/// the network reply