Why repair Sims4 after computer updates?

Fengjui  That depends on which antivirus you use.  You can find examples (Avast/AVG and Windows Defender) here:

https://crinrict.com/blog/2020/10/add-exceptions-to-anti-virus-programs.html

If this doesn't help, the publisher of your antivirus should have documentation online for setting exceptions and other ways to prevent the AV from blocking a program.