August has seen a flurry of buggy patches:
Win10 1607 – KB 4033637, which arrived last Friday via Auto Update, is still undocumented. A Reddit thread credits Microsoft as saying it’s a July security patch for Flash. Abbodi86 on AskWoody has a different view: it’s an update to the Compatibility Appraiser, which is the software that scans a PC to see whether it’s ready to move to the next version. Günter Born concurs with Abbodi86. (I wonder if it’s a precursor to the Fall Creators Update.) There’s no explanation about why Microsoft refuses to document it, or talk about it.
Source: Computerworld.com | Security