COMSOL 4.4 Installation-Error

Hi,

I am trying to install COMSOL 4.4 in my machine. I have already installed COMSOL 4.3b and its license manager. I would like to keep 4.3b version in my machine too. When I setup a new license manager for 4.4, and open the COMSOL 4.4, I am getting the following error.

License error: -25
License server system does not support this version of this product.

Could anyone help on this?.

Thanks,
Krish