diff --git a/installer/mc2_installer.nsi b/installer/mc2_installer.nsi
index e527b3778..8e873bbd5 100644
--- a/installer/mc2_installer.nsi
+++ b/installer/mc2_installer.nsi
@@ -20,15 +20,19 @@ Name "${PROJECT_NAME} ${SUB_NAME}"
 
 ShowInstDetails show	;show/hide
 
+Var RemoveOldDatabases
+
 !include "LanguageStrings.nsh"
 !insertmacro MUI_LANGUAGE "English"
 
 InstallDir "$PROGRAMFILES\${INSTALL_DIR}"
 InstallDirRegKey HKCU "Software\${INSTALL_DIR}" ""
 
+; Installation pages order
 !insertmacro MUI_PAGE_LICENSE "..\LICENSE.txt"
 !insertmacro MUI_PAGE_DIRECTORY
 ;!insertmacro MUI_PAGE_COMPONENTS
+Page custom RemoveOldFilesPage RemoveOldFilesLeave  ;Custom page
 !insertmacro MUI_PAGE_INSTFILES
 
 
@@ -47,11 +51,18 @@ Section "mC2installation" main
 	File /r "..\bin\release\resources"
 
 	SetOutPath "$INSTDIR\plugins"
+	Delete "*.dll"
 	File /r "..\bin\release\plugins\*.dll"
 
 	SetAutoClose false
 
 
+	IntCmpU $RemoveOldDatabases 0 DoNotRemoveDBFiles
+	; Remove the app data
+	RMDir /r $APPDATA\mC2
+	DoNotRemoveDBFiles:
+
+
 	CreateDirectory "$SMPROGRAMS\${PROJECT_NAME} ${SUB_NAME}"
 	CreateShortCut "$SMPROGRAMS\${PROJECT_NAME} ${SUB_NAME}\${PROJECT_NAME}.lnk" "$INSTDIR\mC2.exe"
 	CreateShortCut "$SMPROGRAMS\${PROJECT_NAME} ${SUB_NAME}\musikServer.lnk" "$INSTDIR\musikServer.exe"
@@ -72,5 +83,15 @@ Section Uninstall
 SectionEnd
 
 Function .onInit
+	!insertmacro MUI_INSTALLOPTIONS_EXTRACT "remove_old_db.ini"
 FunctionEnd
 
+Function RemoveOldFilesPage
+	!insertmacro MUI_HEADER_TEXT "mC2 installation" "Removing old database files"
+	!insertmacro MUI_INSTALLOPTIONS_WRITE "remove_old_db.ini" "Field 2" "Text" "Remove old mC2 databases in $APPDATA\mC2"
+	!insertmacro MUI_INSTALLOPTIONS_DISPLAY "remove_old_db.ini"
+FunctionEnd
+
+Function RemoveOldFilesLeave
+		!insertmacro MUI_INSTALLOPTIONS_READ $RemoveOldDatabases "remove_old_db.ini" "Field 2" "State"
+FunctionEnd
diff --git a/installer/remove_old_db.ini b/installer/remove_old_db.ini
new file mode 100644
index 000000000..86c684e93
--- /dev/null
+++ b/installer/remove_old_db.ini
@@ -0,0 +1,29 @@
+; Ini file generated by the HM NIS Edit IO designer.
+[Settings]
+NumFields=3
+
+[Field 1]
+Type=Groupbox
+Text=Remove old files
+Left=10
+Right=258
+Top=7
+Bottom=83
+
+[Field 2]
+Type=Checkbox
+Text=Remove old mC2 databases
+Left=29
+Right=242
+Top=52
+Bottom=83
+State=1
+
+[Field 3]
+Type=Label
+Text=If you have run an old version of mC2, you need to remove the old databases since they are incompatible with the latest version of mC2.
+Left=22
+Right=248
+Top=23
+Bottom=52
+