Downloaded and installed C-130 X Pack.  Several times.  No aircraft appear in the select airplane list on FSX.  Followed all the download rules.  Looked in KB but nothing there.  Turned off antivirus, real time protection, ran as administrator.  Install said successful install.  All files appear to be present in FSX Aircraft files list. Did complete uninstall and reinstall several times.  No joy.  Running FSX SE on high end computer in Win 11.