California state says my calculations were wrong and asking for additional payment, can't get old turbo tax software on new device

Hi,

     I filed my taxes with Turbotax for both Federal & state tax returns. I received a letter from California State about Tax return changes, asking for an additional payment of $1300 with a fine because of the wrong calculation. 

 

my PC has since changed and I don't have turbo tax software installed, I purchased it from Costco and downloaded it with a license code. How can I get it installed again on my new device? Also any help I can get from Turbo tax consultants in this situation. 

 

Thanks