Running Silverlight can increase the opportunities for malicious hackers to compromise your computer. There are several ways to protect yourself from these types of attacks, but one thing thats essential if you dont want to completely eradicate Silverlight from your computer is to keep it updated. Microsoft Silverlight updates are automatically installed automatically, alongside the standard Windows Update mechanism. If youre on OS X, Microsoft offer step-by-step uninstall instructions here. For Windows users, the removal procedure is very similar to that of Adobe Flash.”]
Source: https://grahamcluley.com/update-silverlight-uninstall-completely/