diff --git a/optional/install-ausweisapp2.cmd b/optional/install-ausweisapp2.cmd
index 33614b2..4a3e27c 100644
--- a/optional/install-ausweisapp2.cmd
+++ b/optional/install-ausweisapp2.cmd
@@ -2,7 +2,7 @@
 
 set OPT=..\optional
 set SOFTWARE=..\software
-set MSI=ausweisapp2.msi
+set MSI=ausweisapp2-setup.msi
 
 if NOT EXIST %SOFTWARE%\%MSI% (
   echo ERROR: %SOFTWARE%\%MSI% not found!
@@ -11,6 +11,7 @@ if NOT EXIST %SOFTWARE%\%MSI% (
 
 echo ####### %0 #######
 
+echo installing Ausweisapp 2 ...
 cd %SOFTWARE%
 @echo on
 msiexec /i %MSI% /quiet
diff --git a/optional/install-dbbrowser.cmd b/optional/install-dbbrowser.cmd
index c698bfd..0bae0cf 100644
--- a/optional/install-dbbrowser.cmd
+++ b/optional/install-dbbrowser.cmd
@@ -12,6 +12,7 @@ if NOT EXIST %SOFTWARE%\%MSI% (
 
 echo ####### %0 #######
 
+echo installing DB-Browser ...
 cd %SOFTWARE%
 @echo on
 msiexec /i %MSI% /passive
diff --git a/optional/install-emclient.cmd b/optional/install-emclient.cmd
index f6d0bb3..7a348fc 100644
--- a/optional/install-emclient.cmd
+++ b/optional/install-emclient.cmd
@@ -12,6 +12,7 @@ if NOT EXIST %SOFTWARE%\%MSI% (
 
 echo ####### %0 #######
 
+echo installing em-Client ...
 cd %SOFTWARE%
 @echo on
 msiexec /i %MSI% /quiet
diff --git a/optional/install-telegram.cmd b/optional/install-telegram.cmd
new file mode 100644
index 0000000..1b624b0
--- /dev/null
+++ b/optional/install-telegram.cmd
@@ -0,0 +1,31 @@
+@echo off
+
+set EXE=..\software\telegram-setup.exe
+set STARTMENU="%PROGRAMDATA%\Microsoft\Windows\Start Menu\Programs"
+set STARTMENU_USER="%APPDATA%\Microsoft\Windows\Start Menu\Programs"
+
+if NOT EXIST %EXE% (
+  echo ERROR: %EXE% not found!
+  exit /b
+)
+
+echo ####### %0 #######
+
+echo installing Telegram Desktop Client ...
+start /wait %EXE% /silent /norestart %EXE%
+
+echo moving Telegram startmenu shortcut ...
+move /Y %STARTMENU_USER%\"Telegram Desktop\Telegram.lnk" %STARTMENU%
+
+echo removing Telegram startmenu folder ...
+rd /S /Q %STARTMENU_USER%\"Telegram Desktop" 2>nul
+
+echo moving Telegram Desktop icon ...
+move /Y "%USERPROFILE%\Desktop\Telegram.lnk" %PUBLIC%\Desktop
+
+rem refresh desktop (W10 style)
+ie4uinit.exe -show
+
+echo ####### %0 #######
+pause
+
diff --git a/software/optional.csv b/software/optional.csv
index cf4f7b5..e17f260 100644
--- a/software/optional.csv
+++ b/software/optional.csv
@@ -26,4 +26,5 @@ https://swupdate.openvpn.net/as/clients/openvpn-connect-2.7.1.111_signed.msi ope
 https://cdn-fastly.obsproject.com/downloads/OBS-Studio-27.0.1-Full-Installer-x64.exe obsstudio-setup.exe
 https://github.com/mhgschmidt/snapcontrol/releases/download/V1.07/snapcontrol.zip snapcontrol.zip
 https://download.oracle.com/java/17/latest/jdk-17_windows-x64_bin.exe java-setup.exe
-https://www.ausweisapp.bund.de/fileadmin/user_upload/Software/AusweisApp2-1.22.5.msi ausweisapp2.msi
+https://www.ausweisapp.bund.de/fileadmin/user_upload/Software/AusweisApp2-1.22.5.msi ausweisapp2-setup.msi
+https://updates.tdesktop.com/tx64/tsetup-x64.3.7.3.exe telegram-setup.exe