diff --git a/api/logic/modplatform/modpacksch/FTBPackInstallTask.cpp b/api/logic/modplatform/modpacksch/FTBPackInstallTask.cpp
index b3c97c7b2..6067c56aa 100644
--- a/api/logic/modplatform/modpacksch/FTBPackInstallTask.cpp
+++ b/api/logic/modplatform/modpacksch/FTBPackInstallTask.cpp
@@ -1,6 +1,7 @@
 #include "FTBPackInstallTask.h"
 
 #include "BuildConfig.h"
+#include "Env.h"
 #include "FileSystem.h"
 #include "Json.h"
 #include "minecraft/MinecraftInstance.h"
@@ -94,11 +95,19 @@ void PackInstallTask::downloadPack()
     for(auto file : m_version.files) {
         if(file.serverOnly) continue;
 
+        QFileInfo fileName(file.name);
+        auto cacheName = fileName.completeBaseName() + "-" + file.sha1 + "." + fileName.suffix();
+
+        auto entry = ENV.metacache()->resolveEntry("ModpacksCHPacks", cacheName);
+        entry->setStale(true);
+
         auto relpath = FS::PathCombine("minecraft", file.path, file.name);
         auto path = FS::PathCombine(m_stagingPath, relpath);
 
         qDebug() << "Will download" << file.url << "to" << path;
-        auto dl = Net::Download::makeFile(file.url, path);
+        filesToCopy[entry->getFullPath()] = path;
+
+        auto dl = Net::Download::makeCached(file.url, entry);
         if (!file.sha1.isEmpty()) {
             auto rawSha1 = QByteArray::fromHex(file.sha1.toLatin1());
             dl->addValidator(new Net::ChecksumValidator(QCryptographicHash::Sha1, rawSha1));
@@ -126,6 +135,19 @@ void PackInstallTask::downloadPack()
 
 void PackInstallTask::install()
 {
+    setStatus(tr("Copying modpack files"));
+
+    for (auto iter = filesToCopy.begin(); iter != filesToCopy.end(); iter++) {
+        auto &from = iter.key();
+        auto &to = iter.value();
+        FS::copy fileCopyOperation(from, to);
+        if(!fileCopyOperation()) {
+            qWarning() << "Failed to copy" << from << "to" << to;
+            emitFailed(tr("Failed to copy files"));
+            return;
+        }
+    }
+
     setStatus(tr("Installing modpack"));
 
     auto instanceConfigPath = FS::PathCombine(m_stagingPath, "instance.cfg");
diff --git a/api/logic/modplatform/modpacksch/FTBPackInstallTask.h b/api/logic/modplatform/modpacksch/FTBPackInstallTask.h
index 4f7786fd7..3b2d60de4 100644
--- a/api/logic/modplatform/modpacksch/FTBPackInstallTask.h
+++ b/api/logic/modplatform/modpacksch/FTBPackInstallTask.h
@@ -37,6 +37,8 @@ private:
     QString m_version_name;
     Version m_version;
 
+    QMap<QString, QString> filesToCopy;
+
 };
 
 }