diff --git a/LaunchServer/source/response/update/UpdateResponse.java b/LaunchServer/source/response/update/UpdateResponse.java
index d549548..8aa72bb 100644
--- a/LaunchServer/source/response/update/UpdateResponse.java
+++ b/LaunchServer/source/response/update/UpdateResponse.java
@@ -3,7 +3,6 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Deque;
 import java.util.LinkedList;
@@ -40,6 +39,7 @@
         // Write update hdir
         debug("Update dir: '%s'", updateDirName);
         hdir.write(output);
+        output.writeBoolean(server.config.compress);
         output.flush();
 
         // Prepare variables for actions queue
@@ -87,7 +87,7 @@
 
                         // Resolve and write file
                         Path file = dir.resolve(action.name);
-                        if (Files.size(file) != hFile.size()) {
+                        if (IOHelper.readAttributes(file).size() != hFile.size()) {
                             fileOutput.write(0x0);
                             fileOutput.flush();
                             throw new IOException("Unknown hashed file: " + action.name);
@@ -121,5 +121,8 @@
         }
 
         // So we've updated :)
+        if (fileOutput instanceof DeflaterOutputStream) {
+            ((DeflaterOutputStream) fileOutput).finish();
+        }
     }
 }
diff --git a/Launcher/source/helper/IOHelper.java b/Launcher/source/helper/IOHelper.java
index a5e0fb6..6aa6103 100644
--- a/Launcher/source/helper/IOHelper.java
+++ b/Launcher/source/helper/IOHelper.java
@@ -264,14 +264,14 @@
 
     @LauncherAPI
     public static Deflater newDeflater() {
-        Deflater deflater = new Deflater(Deflater.DEFAULT_COMPRESSION, false);
+        Deflater deflater = new Deflater(Deflater.DEFAULT_COMPRESSION, true);
         deflater.setStrategy(Deflater.DEFAULT_STRATEGY);
         return deflater;
     }
 
     @LauncherAPI
     public static Inflater newInflater() {
-        return new Inflater(false);
+        return new Inflater(true);
     }
 
     @LauncherAPI
diff --git a/Launcher/source/request/update/UpdateRequest.java b/Launcher/source/request/update/UpdateRequest.java
index e76eb28..e67b1d7 100644
--- a/Launcher/source/request/update/UpdateRequest.java
+++ b/Launcher/source/request/update/UpdateRequest.java
@@ -82,8 +82,6 @@
 
     @Override
     protected SignedObjectHolder<HashedDir> requestDo(HInput input, HOutput output) throws IOException, SignatureException {
-        compress = input.readBoolean();
-
         // Write update dir name
         output.writeString(dirName, 255);
         output.flush();
@@ -93,12 +91,16 @@
         SignedObjectHolder<HashedDir> remoteHDirHolder = new SignedObjectHolder<>(input, config.publicKey, HashedDir::new);
         Diff diff = remoteHDirHolder.object.diff(localDir, matcher);
         totalSize = diff.mismatch.size();
+        compress = input.readBoolean();
 
         // Build actions queue
         Queue<Action> queue = new LinkedList<>();
         fillActionsQueue(queue, diff.mismatch);
         queue.add(Action.FINISH);
 
+        // noinspection IOResourceOpenedButNotSafelyClosed
+        InputStream fileInput = compress ? new InflaterInputStream(input.stream, IOHelper.newInflater(), IOHelper.BUFFER_SIZE) : input.stream;
+
         // Download missing first
         // (otherwise it will cause mustdie indexing bug)
         startTime = Instant.now();
@@ -117,8 +119,6 @@
             output.flush();
 
             // Perform actions
-            // noinspection IOResourceOpenedButNotSafelyClosed
-            InputStream fileInput = compress ? new InflaterInputStream(input.stream, IOHelper.newInflater(), IOHelper.BUFFER_SIZE) : input.stream;
             for (int i = 0; i < length; i++) {
                 Action action = actionsSlice[i];
                 switch (action.type) {