[v2025.1 or later]

Integrated into the Libero SoC installer.
Select Custom in Select Installation Type, then select Standalone Program Debug and install.
https://www.microchip.com/en-us/products/fpgas-and-plds/fpga-and-soc-design-tools/fpga/libero-software-later-versions

[Up to v2024.2]

Please download it from the Software Download Archive tab at the URL below.
https://www.microchip.com/en-us/products/fpgas-and-plds/fpga-and-soc-design-tools/programming-and-debug/lab