Because portable versions are not signed official releases, you are trusting a third-party repacker. Malicious actors have been known to inject:

Verdict: Only download LDPlayer 9 Portable from reputable, long-standing portable software archives. Never download from a random MediaFire or Mega.nz link posted in a forum.

Yes, under three conditions:

No, if:

Standard emulators constantly write logs and cache to your C: drive. The portable version keeps all read/write cycles contained within its own folder. If you keep that folder on a secondary HDD, you preserve your primary OS drive’s lifespan. When you’re done with the emulator? Delete the folder. Zero registry leftovers.