diff --git a/bin/Packager/NullsoftInstaller.nsi b/bin/Packager/NullsoftInstaller.nsi
--- a/bin/Packager/NullsoftInstaller.nsi
+++ b/bin/Packager/NullsoftInstaller.nsi
@@ -35,13 +35,26 @@
 ;--------------------------------
 
 XPStyle on
-ShowInstDetails hide
-ShowUninstDetails hide
+
 
 Name "@{productname}"
 Caption "@{productname} @{version}"
 
 OutFile "@{setupname}"
+
+!define MULTIUSER_EXECUTIONLEVEL Highest
+!define MULTIUSER_MUI
+!define MULTIUSER_INSTALLMODE_COMMANDLINE
+!define MULTIUSER_INSTALLMODE_DEFAULT_REGISTRY_KEY "${regkey}"
+!define MULTIUSER_INSTALLMODE_DEFAULT_REGISTRY_VALUENAME "Install_Mode"
+!define MULTIUSER_INSTALLMODE_INSTDIR "@{productname}"
+!define MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_KEY "${regkey}"
+!define MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_VALUENAME "Install_Dir"
+
+;!define MULTIUSER_USE_PROGRAMFILES64
+@{multiuser_use_programfiles64}
+;!define MULTIUSER_USE_PROGRAMFILES64
+!include "MultiUser.nsh"
 !include "MUI2.nsh"
 !include "LogicLib.nsh"
 !include "x64.nsh"
@@ -56,6 +69,7 @@
 @{license}
 ;!insertmacro MUI_PAGE_LICENSE
 
+!insertmacro MULTIUSER_PAGE_INSTALLMODE
 !insertmacro MUI_PAGE_DIRECTORY
 !insertmacro MUI_PAGE_INSTFILES
 !insertmacro MUI_UNPAGE_CONFIRM
@@ -71,45 +85,37 @@
 CRCCheck on
 SilentInstall normal
 
-InstallDir "@{defaultinstdir}\@{productname}"
-; InstallDirRegKey must use HKLM
-InstallDirRegKey HKLM "${regkey}" "Install_Dir"
-
-Var /global ExistingInstallation
-
 Function .onInit
-!if @{architecture} == "x64"
-  ${IfNot} ${RunningX64}
-  MessageBox MB_OK|MB_ICONEXCLAMATION "This installer can only be run on 64-bit Windows."
-  Abort
-  ${EndIf}
-!endif
-;InstallDirRegKey must use HKLM
-ReadRegStr $R0 HKLM "${regkey}" "Install_Dir"
-${IfNot} $R0 == ""
-  StrCpy $ExistingInstallation $R0
-${EndIf}
+    !insertmacro MULTIUSER_INIT
+    !if @{architecture} == "x64"
+        ${IfNot} ${RunningX64}
+            MessageBox MB_OK|MB_ICONEXCLAMATION "This installer can only be run on 64-bit Windows."
+            Abort
+        ${EndIf}
+    !endif
 FunctionEnd
 
+Function un.onInit
+    !insertmacro MULTIUSER_UNINIT
+FunctionEnd
 
 ;--------------------------------
 
 AutoCloseWindow false
 
 
 ; beginning (invisible) section
 Section
-${IfNot} $ExistingInstallation == ""
-  ExecWait '"$ExistingInstallation\${uninstaller}" /S _?=$ExistingInstallation'
-${EndIf}
-  WriteRegStr @{HKLM} "${regkey}" "Install_Dir" "$INSTDIR"
+  ExecWait '"$MultiUser.InstDir\${uninstaller}" /S _?=$MultiUser.InstDir'
+  WriteRegStr SHCTX "${regkey}" "Install_Dir" "$INSTDIR"
+  WriteRegStr SHCTX "${MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_KEY}" "${MULTIUSER_INSTALLMODE_DEFAULT_REGISTRY_VALUENAME}" "$MultiUser.InstallMode"
   ; write uninstall strings
-  WriteRegStr @{HKLM} "${uninstkey}" "DisplayName" "@{productname}"
-  WriteRegStr @{HKLM} "${uninstkey}" "UninstallString" '"$INSTDIR\${uninstaller}"'
-  WriteRegStr @{HKLM} "${uninstkey}" "DisplayIcon" "$INSTDIR\@{iconname}"
-  WriteRegStr @{HKLM} "${uninstkey}" "URLInfoAbout" "@{website}"
-  WriteRegStr @{HKLM} "${uninstkey}" "Publisher" "@{company}"
-  WriteRegStr @{HKLM} "${uninstkey}" "DisplayVersion" "@{version}"
+  WriteRegStr SHCTX "${uninstkey}" "DisplayName" "@{productname}"
+  WriteRegStr SHCTX "${uninstkey}" "UninstallString" '"$INSTDIR\${uninstaller}"'
+  WriteRegStr SHCTX "${uninstkey}" "DisplayIcon" "$INSTDIR\@{iconname}"
+  WriteRegStr SHCTX "${uninstkey}" "URLInfoAbout" "@{website}"
+  WriteRegStr SHCTX "${uninstkey}" "Publisher" "@{company}"
+  WriteRegStr SHCTX "${uninstkey}" "DisplayVersion" "@{version}"
 
   @{registy_hook}
 
@@ -152,8 +158,12 @@
 ; TODO: we need something independent of a tier3....
 nsExec::ExecToLog '"$INSTDIR\bin\kdeinit5.exe" "--shutdown"'
 
-DeleteRegKey @{HKLM} "${uninstkey}"
-DeleteRegKey @{HKLM} "${regkey}"
+${If} $MultiUser.InstallMode == "CurrentUser"
+    SetShellVarContext current
+${EndIf}
+
+DeleteRegKey SHCTX "${uninstkey}"
+DeleteRegKey SHCTX "${regkey}"
 
 Delete "${startmenu}\@{productname}.lnk"
 Delete "${startmenu}\Uninstall.lnk"
diff --git a/bin/Packager/NullsoftInstallerPackager.py b/bin/Packager/NullsoftInstallerPackager.py
--- a/bin/Packager/NullsoftInstallerPackager.py
+++ b/bin/Packager/NullsoftInstallerPackager.py
@@ -70,6 +70,7 @@
         defines.setdefault("architecture", CraftCore.compiler.architecture)
         defines.setdefault("company", "KDE")
         defines.setdefault("defaultinstdir", "$PROGRAMFILES64" if CraftCore.compiler.isX64() else "$PROGRAMFILES")
+        defines.setdefault("multiuser_use_programfiles64", "!define MULTIUSER_USE_PROGRAMFILES64" if CraftCore.compiler.isX64() else "")
         defines.setdefault("icon", os.path.join(CraftCore.standardDirs.craftBin(), "data", "icons", "craft.ico"))
         defines.setdefault("license", "")
         defines.setdefault("productname", self.subinfo.displayName)
@@ -128,11 +129,6 @@
         if not defines["license"] == "":
             defines["license"] = f"""!insertmacro MUI_PAGE_LICENSE "{defines["license"]}" """
 
-        defines["HKLM"] = "HKLM32" if CraftCore.compiler.isX86() else "HKLM64"
-        defines["HKCR"] = "HKCR32" if CraftCore.compiler.isX86() else "HKCR64"
-        defines["HKCU"] = "HKCU32" if CraftCore.compiler.isX86() else "HKCU64"
-
-
         shortcuts = []
         if "executable" in defines:
             shortcuts.append(self._createShortcut(defines["productname"], defines["executable"]))