Apps require update on laptop, but software update shows current

hi, so my sister had this laptop before me whatever she passed it down to me. I was using it while she had this laptop.. and she was able to use all the apps that she wanted and had no restrictions!! I was using it mainly for work for e.g.. I needed to use office 365 and I was able to while the laptop was hers. however, ever since I've logged into it I cannot access or download those apps and its saying the main reasons its because it needs to be updated to the recent whatever. Right so I go and check my software update and its saying its all been updated and that it last checked for an update near a recent amount of time.. I need this sorted ASAP because I need to get my work done. THANK YOU!