Microsoft Team not working in my Macbook which running on Mas OS Yosemite

hi,

i am using a Macbook Pro which run on Mac OS Yosemite from last week onward i cannot use my team on my macbook, it keep tell me to update team app which i did but i still was not able to run it. pls let me know how can i do to make it working again.? 

Thank

Wayne