Just wanted to post a heads-up for anyone else having issues with Armoury Crate SE on the ROG Ally. After an update, AC would no longer load properly - it would open the splash screen and spin. I removed it using the uninstall tool provided by Asus, but when trying to reinstall, I kept getting 501 errors. After lots of back and forth, I tried installing the full version from the Asus site. Near the end I received and error vcruntime140_1.dll was not found. I went here (https://learn.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist?view=msvc-170#visual-studio...) and downloaded both the x64 and x86 redistributables for Visual Studio 2015, 2017, 2019, and 2022. I then ran the uninstall utility again, installed AC SE, and the error disappeared. Hope this helps someone and saves them the 2 hours I spent on this problem.
