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Win10 Slow-flow Anniversary Update

Next week, MS will release the Windows 10 Anniversary Update on Tuesday, August 2. The company has already announced it will be staggering that release for users in the Current Branch. These are the folks who get the latest release via Windows Update. Mary Jo Foley of ZDNet cleverly refers to this it as “Release to Mainstream.” This new decoding for the RTM acronym works well for the world of continuous updates that Windows 10 now inhabits. I myself like to think of the staggered update mechanism as introducing a “slow-flow Anniversary Update.”

Slow-Flow Anniversary Update

Slow-Flow means that not all users will get the Anniversary Update offer from WU at the same time: some will get it sooner, others later.
[Source: Windows Insider Program 6/29/2016 blog post]

Why Is a Slow-flow Anniversary Update in the Cards?

It’s a little early to say how big the Anniversary Update will be, so I turned to a list of ISOs for a recent Insider Preview at These particular ISOs come from the 14393.0 code base released two weeks ago. Those .esd files vary from a low of 1.93 GB to a high of 3.07 GB. 14393.3 appeared late last week, but should be close to the same size. Many Windows watchers, including me, think that 14393 represents the foundation for the upcoming Anniversary Update.

The reason for the slow-flow release is to keep update requests immediately following the release from swamping the Internet and download servers. Instead, Microsoft staggers its update offer across the current installed base. This helps them to manage huge flows from millions of users downloading multi-gigabyte updates all at once. Alas, it also means that some people will wait weeks before they receive an update offer that they can then exercise.

Working Around a Slow-flow Anniversary Update

For those too impatient to wait for an update offer to come their way, there are workarounds. For one, you can grab ISO files from MSDN (if you’re a member). For another,  they’ll be posted to Tech Bench (as soon as MS decides to put them there). It took two week before my test machines got a previous slow-flow Windows 10 update  to upgrade from 1507 to 1511. I was able to grab ISOs from MSDN within a day of the initial release of 1511. They hit TechBench about a week later.