Had to switch the download of the metal mod to manual download.

linux-game-manager.sh

@@ -217,7 +217,7 @@ download_named() {
         rm -v "${cache}/${dest}"
     fi
     # Skip if the item is in cache.
-    test -e "${cache}/${dest}" && continue
+    test -e "${cache}/${dest}" && return
     if ! curl -L4 --output "${cache}/${dest}" "${2}" ; then
         echo "Could not download \"$dest\"..."
         exit 1
@@ -655,13 +655,13 @@ case "${game}" in
             fi
         fi
         doomPath="$(find /usr/share -type d -name "doom" 2> /dev/null | head -1)"
-        # The url breaks the normal download function
         if ! [[ -e "${doomPath}/DoomMetalVol6.wad" ]]; then
         alert
             if dialog --backtitle "Linux Game manager" --yesno "Would you like a metal mod?" -1 -1 --stdout ; then
-                download_named "Doom_Metal_Volume_6_v2.rar" "https://www.moddb.com/downloads/mirror/214324/124/0dbd81ee8d819f6a20da3830ddc20c18/"
+                get_installer "Doom_Metal_Volume_6_v2.rar" "https://www.moddb.com/addons/start/214324"
             fi
         fi
+        # The url breaks the normal download function
         download_named "keyshare-universal.pk3" "https://forum.zdoom.org/download/file.php?id=42262"
         download "https://www.dropbox.com/s/uf01fx3vydua6zx/TobyAccessibilityMod_Version${tobyVersion}.zip?dl=0" "https://www.dropbox.com/scl/fi/bac94s01bl31p6e73pbof/OperationMDK.zip?rlkey=6ufdqgyacakqz6ulr2cue6rtm&dl=1"
         echo "The next step may require your password."