If updating isn’t possible (e.g., macOS 10.13 with latest Omnisphere requiring 10.14+), your only option is to stay on older patches or upgrade your OS/hardware.
This message typically appears when you try to load a patch or multi (from Omnisphere, Trilian, or Keyscape) into an older version of the software. The file was saved with a newer version of the plugin, and the older version cannot read it. this spectrasonics data was created by a newer version