Korbin King

I am trying to use a netbook to access SL and all online searches point to Rainbow viewer 1.19.0.5 for netook use. I have it installed but logging in forces me to upgrade. I have checked Preferences but there isn't an option to disable updates in this viewer. Any help is appreciated. If there is another viewer that is netbook friendly I would be willing to try it as well. Thank you in advance! Korbin