I managed to download them both and open them with Winrar a few weeks ago.
Just downloaded Isolation again and extracted contents using 7-Zip (20.00 alpha)
It warns me of something to do with 32bit but continues to extract.
And the nki loads and plays fine.
Isolation Piano – Tubes & Tape.zip
Size: 4.58 GB (4,926,556,787 bytes)
Size on disk: 4.58 GB (4,926,562,304 bytes)
Isolation Piano – Tubes & Tape Folder
Size: 5.41 GB (5,815,012,352 bytes)
Size on disk: 5.41 GB (5,819,232,256 bytes)
Contains; 2,516 Files, 7 Folders