Starting in May, Microsoft will only release important security updates for Windows, nonessential additions, are paused. Microsoft says it does that to keep Windows running as stable as possible during the corona pandemic.

Microsoft: Timing for upcoming Windows optional C and D releases

We have been evaluating the public health situation, and we understand this is impacting our customers. In response to these challenges we are prioritizing our focus on security updates. Starting in May 2020, we are pausing all optional non-security releases (C and D updates) for all supported versions of Windows client and server products (Windows 10, version 1909 down through Windows Server 2008 SP2).

There is no change to the monthly security updates (B release – Update Tuesday); these will continue as planned to ensure business continuity and to keep our customers protected and productive.