Home windows 11 customers could need to maintain off on one of many newer preview updates which is inflicting issues for .NET Framework 3.5 purposes. Fortunately there are some workarounds for the difficulty, however for now your finest guess is to in all probability keep away from the KB5012643 preview for now.
Microsoft acknowledged the difficulty (by way of BleepingComputer) in a standing replace on the official Windows 11 documents. It states the difficulty is restricted to customers operating model 21H2 of Home windows 11 with the KB5012643 replace put in and means apps utilizing the .NET Framework 3.5 could not work correctly, and even simply straight up fail to open.
This appears to be affecting particular elements within the framework, so not all apps will probably be affected. It seems to be like apps working with non-obligatory options like Home windows Communication and Home windows Workflow Basis on the three.5 framework are the probably to run into issues.
This could embrace lots of console apps and issues like Home windows providers. Microsoft hasn’t offered an inventory of particular apps affected, so it is best to imagine this could have an effect on a variety of applications.
Microsoft recommends uninstalling the replace in the event you expertise any issues. You may get there by going into your Home windows Replace Settings in your PC’s System Settings. From there you need to have the ability to view your replace historical past, and rollback to a earlier model.
If this is not doable, the opposite repair is to re-enable .NET Framework 3.5 and the Home windows Communication Basis in Home windows Options which is discovered by way of the management panel. Microsoft has further instructions on how to do this, however the roll again might be the best and extra full repair if it is accessible to you. At the very least that 40 minute boot time bug has been fixed.
In fact, Microsoft is working to resolve this challenge versus simply providing workarounds. The .NET Framework 3.5 is about to be given primary assist for 2 extra years now, with 5 years of prolonged assist to comply with, so it isn’t going wherever anytime quickly.
