Microsoft bundles updates for a better error-free process
Microsoft delivered the first bundle with CU and SSU updates together for easy installation. Bundling the updates is helpful for system admins that have to update all their machines. Even though they come bundled, you will still have to install the SSU first. If you install the CU first, you may get an error and you will need to install the SSU. If you tried updating Windows 10 manually or by using the Configuration Manager or WSUS, you might have run into some trouble.