How to get instance Excel2016?

[Dang.D.Khanh]

Hi,
My computer is installing 2 versions of excel10 and excel16.
I use the following code to get the running excel instance but it only recognizes excel10.

    LPWSTR pszExcelPath = 
	  L"C:\\Program Files\\Microsoft Office\\root\\Office16\\EXCEL.EXE";

    CreateProcess(pszExcelPath, NULL, 0, 0, 1,
	  NORMAL_PRIORITY_CLASS, 0, NULL, &Start, &ProcInfo);

I don't know what is the purpose of

for (int j = 1; j <= 5; j++)

Although when I run the code, I always get pDisp!=nullptr but I can't query to workbooks from m_XLApp,...

m_XLApp.Attach(static_cast<Interface*> pDisp,true );
if (pUnk)
	pUnk->Release();
wstring s{ m_XLApp->Caption }; <<--vs crash then out debugging.

How I can fix this error?

Edited: There aren't multiple instances running at the same time, I just want to get at least one running instance.

Many thanks!