I've been working on playing my favorite Pikmin song, and my phone recently got rid of all of my saved PDF files. I came back here to get the sheet music for Impact Site and it's no longer there :'( :'( :'(
I think the arranger (Olimar12345) had it taken down. You can find his (updated) sheet off-site here (https://vgmsheetmusicbyolimar12345.com/piano-arrangements/), or look through the internet archives (https://archive.org/) if you're looking specifically for the version that was on the main site.