The android permission for REQUEST_INSTALL_PACKAGES have to be explained via video or has to be removed from your already published apps because the normal usage is now forbidden in playstore.
Some plugins depend on this permission e.g. cordova-plugin-file-opener2, so you have to fix it yourself and remove the plugin or within the plugin the permission. To have a quick workaround for the file opener, you can use this:
cordova plugin remove cordova-plugin-file-opener2 cordova plugin add https://github.com/brospars/cordova-plugin-file-opener2.git