diff --git a/Installomator.sh b/Installomator.sh
index 4f77c53..65bfe87 100755
--- a/Installomator.sh
+++ b/Installomator.sh
@@ -1938,6 +1938,11 @@ malwarebytes)
 mattermost)
     name="Mattermost"
     type="dmg"
+    if [[ $(arch) == i386 ]]; then
+      archiveName="mac.dmg"
+    elif [[ $(arch) == arm64 ]]; then
+      archiveName="mac-m1.dmg"
+    fi
     downloadURL=$(downloadURLFromGit mattermost desktop)
     appNewVersion=$(versionFromGit mattermost desktop )
     expectedTeamID="UQ8HT4Q2XM"