Dynabookは、プレインストールされたアプリが1903対応版にアップされてないと2019が来ない、と案内が出ているが?
Windows 10, version 1903 and Windows Server, version 1903
Loss of functionality in Dynabook Smartphone Link app
Some users may experience a loss of functionality after updating to Windows 10, version 1903 when using the Dynabook Smartphone Link application on Windows devices. Loss of functionality may affect the display of phone numbers
in the Call menu and the ability to answer phone calls on the Windows PC.
To safeguard your update experience, we have applied a compatibility hold on devices with Dynabook Smartphone Link from being offered Windows 10, version 1903, until this issue is resolved.
要約:Dynabook Smartphone Linkアプリが対応するまで1903は配信停止
半年ごとの機能更新は、アプリ・ドライバを全部対応確認してからやってください