bug(windows): automatic updates may not be able to find downloaded packages when admin user is not same as current user

[mcdurdin]

Kmshell -ikp is called, but does not pass any information about downloaded files. The admin user may not even have access to the files for the current user. So we need to consider, in this scenario, how to download and make the files accessible to the admin user.

keyman/windows/src/desktop/kmshell/main/Keyman.System.UpdateStateMachine.pas

Lines 1209 to 1240 in 9c7b1a6

	procedure InstallingState.HandleInstallPackages;
	var
	ucr: TUpdateCheckResponse;
	hasKeymanInstall : Boolean;
	begin
	TUpdateCheckStorage.LoadUpdateCacheData(ucr);
	hasKeymanInstall := TUpdateCheckStorage.HasKeymanInstallFileUpdate(ucr);
	// This event should only be reached in elevated process if not then
	// move on to just installing Keyman
	if not kmcom.SystemInfo.IsAdministrator then
	begin
	if hasKeymanInstall then
	DoInstallKeyman;
	Exit;
	end;
	if (TUpdateCheckStorage.LoadUpdateCacheData(ucr)) then
	begin
	DoInstallPackages(ucr);
	end;
	if hasKeymanInstall then
	begin
	DoInstallKeyman;
	end
	else
	begin
	// There is no Keyman installer we can return to the IdleState
	bucStateContext.RemoveCachedFiles;
	ChangeState(IdleState);
	end;
	end;

See also #16162, as this will also need to handle passing the baselayout setting to the elevated process.