Incredimail xe

Question

I have been using incredimail xe (free version) for a very long time and found it very useful. lately i have problem opening it. let me describe you step by step. when i clicked on the icredimail icon a message appear as "skin dialogbutton.bmp could not be loaded". please upgrade incredimail xe. critical error. this session cannot continue. when i click ok, it will bring me to the incredimail webpage and when i have downloaded upgrade button, it went through the process and come back to the same message "skin dialogbutton.bmp could not be loaded. please upgrade incredimailxe.