When installing the latest version of Ultron Center, there is an error 200 in the last step of the card. The reason may be that double-clicking the installation directly or using powershell ordinary add-appx packaging command leads to the failure of signature verification, so just use powershell command (skipping signature verification) to reinstall and wait for a period of time to successfully install.
No matter whether your computer has windows Appinstaller program or not, you can use powershell to install UWP program, but you may encounter 400 and 200 errors during the installation process, which makes it impossible to continue the installation.