diff --git a/LaunchServer/source/response/update/UpdateResponse.java b/LaunchServer/source/response/update/UpdateResponse.java
index 33bc6ae..7437284 100644
--- a/LaunchServer/source/response/update/UpdateResponse.java
+++ b/LaunchServer/source/response/update/UpdateResponse.java
@@ -2,6 +2,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Deque;
 import java.util.LinkedList;
@@ -82,6 +83,12 @@
 
                         // Resolve and write file
                         Path file = dir.resolve(action.name);
+                        if (Files.size(file) != hFile.size()) {
+                            output.writeBoolean(false);
+                            output.flush();
+                            throw new IOException("Unknown hashed file: " + action.name);
+                        }
+                        output.writeBoolean(true);
                         try (InputStream fileInput = IOHelper.newInput(file)) {
                             IOHelper.transfer(fileInput, output.stream);
                         }
diff --git a/Launcher/TODO.txt b/Launcher/TODO.txt
new file mode 100644
index 0000000..b5f4c32
--- /dev/null
+++ b/Launcher/TODO.txt
@@ -0,0 +1,3 @@
+1) обновить форж и тд 1.10.2
+2) сделать 1.11
+3) сделать 1.5.2
diff --git a/Launcher/source/request/update/UpdateRequest.java b/Launcher/source/request/update/UpdateRequest.java
index ac36412..9b4ec3a 100644
--- a/Launcher/source/request/update/UpdateRequest.java
+++ b/Launcher/source/request/update/UpdateRequest.java
@@ -10,12 +10,10 @@
 import java.time.Duration;
 import java.time.Instant;
 import java.util.LinkedList;
-import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Objects;
 import java.util.Queue;
 
-import launcher.Launcher;
 import launcher.Launcher.Config;
 import launcher.LauncherAPI;
 import launcher.hasher.FileNameMatcher;
@@ -120,7 +118,11 @@
                         Files.createDirectories(currentDir);
                         break;
                     case GET:
-                        downloadFile(currentDir.resolve(action.name), (HashedFile) action.entry, input);
+                        Path targetFile = currentDir.resolve(action.name);
+                        if (!input.readBoolean()) {
+                            throw new IOException("Serverside cached size mismath for file " + action.name);
+                        }
+                        downloadFile(targetFile, (HashedFile) action.entry, input);
                         break;
                     case CD_BACK:
                         currentDir = currentDir.getParent();