Emulating Windows XP via VirtualBox is often recommended to stabilize performance on modern hardware.
Official copies of Logic Platinum 5.5.1 required a purple USB . Without it, the software ran in demo mode (no saving, audio cutouts). The "Full" cracks floating around typically bypass this requirement by using a patched EmagicLogic5.exe or a soft-dongle emulator called H2O or Paradox . emagic logic audio platinum 5 5 1oxygen 32 full
Are you trying to from a Logic 5 system, or are you looking to install it on a specific modern operating system? Logic Pro 7 & earlier - Logic Audio 5.5.1 for Windows 10??? Emulating Windows XP via VirtualBox is often recommended