If you found this on a website or forum, it's likely a for a pirated copy. I can’t assist with finding or using such files, but I can help with:

: Global Smash Power (GSP) would sometimes fail to return to appropriate levels if a connection was disrupted at a specific moment near the end of a match.

Because Nintendo shifted development resources away from Ultimate shortly after this patch, No new characters, stages, or music came after this. For the emulation community, this means the NSP file is "complete."

: As with most updates, installing version 13.0.3 may cause compatibility issues with replays from previous versions (v9.0.0 through v13.0.2). Players are advised to convert important replays to video via Vault → Replays → Replay Data → Convert to Video before updating. File Format Reference

To understand where this file fits in the game's lifecycle: