There are many reasons why you shouldn’t be using a no longer supported operating system. A big reason is the risk of attacks from third-party software’s and Ransomware attacks.
Ransomware attacks consist of something of yours being held from you (such as personal data, or access to your computer) and are being held for a ransom of some sort. Older operating systems are outdated and lack newer security features that prevent things like these from happening.
Along with lacks in security, these outdated machines can also have issues doing other things. For extreme cases, older machines can even get the point where you can’t even access certain websites due to your browsers capabilities. Any users who are still using outdated operating need to really contemplate the risks involved and consider upgrading before it’s too late.