On a fresh installation of w7 that was just updated with simplix 21.9.15, I wanted to install powershell 3+ earlier. Since I could not find an old version for it, I went straight for 7.x (7.1.4). In order for that to be installed on w7, windows management framework 5.1 needs to be installed beforehand. And in order for that to be installed, some KB3191566 update was downloaded and installed. Wasn't that supposed to be in the update pack? As for my app that could not connect to its server 5 days ago, I updated my system with simplix 21.9.15 and it now works.