Yes it is compatible. Unfortunately for yourself only having dialup you will struggle to do the install easily as the program is 137+ mg for install and updates. the 4.12 you mention is like an installer pckage for the AVG program. The best way that I can think of is connecting to a friends internet who has broadband and do the install from there. Future updates are only a few meg and dialup should cope if you leave the update downloading in the background. I think most AV programs now are of a similar file size.