Avast antivirus provides excellent and powerful capabilities to strengthen the security parameters of devices and data. This security product is compatible with mobile and computer devices. Moreover, like any other software product, Avast can sometimes show some errors. From various errors, it can show the product not updating is one of them. You can fix this problem quickly with the help of some effective solutions. Here is a complete guide that will explain to you the reason for the issue and multiple solutions to fix the Avast antivirus not updating error.