Are you trying to in a Superlite build, or Standalone BLAST Setup for Windows PC - NCBI
Because these "Superlite" versions are modified by third-party creators and are not official Microsoft releases, you won't find them on the Microsoft Software Download page. mpb blastx windows 10 superlite link
Because these are unofficial "ISO" files, they are not hosted on Microsoft's website. They are typically found on community-driven archival sites: Internet Archive : You can find versions such as Windows 10 19H1 Home Edition SuperLite (MPB) hosted on the Internet Archive TeamOS or Ghost Spectre Sites Are you trying to in a Superlite build,
Many "BlastX" builds include pre-applied registry tweaks meant to reduce input lag and improve frame rates (FPS) in competitive games. mpb blastx windows 10 superlite link