diff --git a/install.sh b/install.sh
index b3e4a8e..a750dab 100755
--- a/install.sh
+++ b/install.sh
@@ -81,12 +81,17 @@ download_and_extract() {
         wget -qO "$TMP_TAR" "$TAR_URL" || die "Download failed"
     fi
 
+    if ! file "$TMP_TAR" | grep -q 'gzip'; then
+        rm -f "$TMP_TAR"
+        die "Download failed or URL returned invalid content"
+    fi
+
     # Preserve existing config if updating
     if [[ -f "$INSTALL_DIR/qlpycon.conf" ]]; then
         warn "Existing qlpycon.conf found - keeping it"
-        tar -xzf "$TMP_TAR" -C "$INSTALL_DIR" --exclude='qlpycon.conf'
+        tar -xzf "$TMP_TAR" -C "$INSTALL_DIR" --exclude='qlpycon.conf' || die "Extraction failed"
     else
-        tar -xzf "$TMP_TAR" -C "$INSTALL_DIR"
+        tar -xzf "$TMP_TAR" -C "$INSTALL_DIR" || die "Extraction failed"
     fi
 
     rm -f "$TMP_TAR"