installer: fix an issue

- also take care of emergency releases when updating LyX
- add some prerequisites for a new feature

development/Win32/packaging/installer/include/init.nsh

@@ -611,6 +611,15 @@ Function .onInit
    Abort
   ${endif}
   
+  # FIXME: check that LyX is not currently running
+  #System::Call 'kernel32::CreateMutexA(i 0, i 0, t "LyX.exe.Instance") i .r1 ?e'
+  #Pop $R0
+  #MessageBox MB_OK "$R0"
+  #${if} $R0 != "0"
+  # MessageBox MB_OK|MB_ICONSTOP "$(LyXRunning)" 
+  # Abort
+  #${endif}
+  
   !insertmacro MULTIUSER_INIT
   
   # check if this LyX version is already installed
@@ -653,6 +662,7 @@ Function .onInit
     # we don't stop here because we want the latest installed version
    ${endif} 
   ${next}
+  
   ${if} $OldVersionNumber > ${APP_SERIES_KEY}
    # store the version number and reformat it temporarily for the error message
    StrCpy $R0 $OldVersionNumber

development/Win32/packaging/installer/setup/configure.nsh

@@ -54,6 +54,8 @@ Section -InstallData
   # if we install over an existing version, remove the old uninstaller information
   ${if} $OldVersionNumber != ""
    DeleteRegKey SHCTX "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}$OldVersionNumber"
+   # also delete in the case of an emergency release
+   DeleteRegKey SHCTX "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}$OldVersionNumber1"
   ${endif}
   
 SectionEnd