There are two solutions: after uninstalling the old version of the app, reinstall the app you want to install; If you still can't install the old version after uninstalling, please check whether there are any application residual folders below, delete the corresponding folders and reinstall. This phenomenon may also be due to incomplete application uninstallation. The performance of this situation is that there is no application similar to the one you installed on your mobile phone, and you have deleted the related application folder. This situation is caused by incomplete application uninstallation.