how to upgrade WO manually:
1. overwrite mcu: vmcu_weboffice.exe + all the .dll files in mcu folder + all the .db files in mcu folder
2. overwrite web(the whole folder): ~/web
      note: if you make customized changes in file ~/web/getmcuinfo.php, backup this file before the overwrite and redo the changes after the overwrite.
3. overwrite manage(the whole folder): ~/manage
4. overwrite accessory files in mcu folder if neccessary: mng.exe, jnj.htm, jnj2.htm
5. check the difference and modify the ini file:
~/configm.ini