Question

I downloaded from my PreSonus account. I tried dragging into S1 and I tried double clicking. I do not get an error message. The window says it is installing but 6 of them do not show up Sounds like the others.

Model Name:    iMac

Model Identifier:    iMac17,1

  Processor Name:    Intel Core i5

  Processor Speed:    3.2 GHz

  Number of Processors:    1

  Total Number of Cores:    4

  L2 Cache (per Core):    256 KB

  L3 Cache:    6 MB

  Memory:    8 GB

Available:    962.34 GB (962,340,524,032 bytes)

  Capacity:    1.02 TB (1,021,994,074,112 bytes)

Answer 1

See if anything from this KB article linked below is helpful to you.  The part quoted below is from the very bottom of the KB article.

http://support.presonus.com/hc/en-us/articles/210040293--5-Installing-Additional-Content-PreSonus-Sound-Sets-

*Potential issues with Corrupted Downloaded and/or installed Sound Set files. 

On occasions the installed and/or downloaded Sound Sets file can become corrupted.

If you ever get a warning on the StudioOne load screen that a sound sets has become corrupted or is not loading properly, the installed sound set can be removed from your system and then re-installed directly from the installer built into StudioOne or directly from your user account. 

* It is advised that you first remove the affected sound sets file from your sound set library that is on your system before downloading and reinstalling a new instance of the sound set file on your system. 

The library StudioOne scans can be found in your StudioOne software for reference. By default it will be Documents/Studio One/Sound Sets.

That file path can be found under the "StudioOne" menu --> Drop down select (PC - "Options" || Mac - "Preferences") --> "Locations" --> "Sound Sets".

*Dragging and dropping a Sound Set file onto the StudioOne start page will install that sound set to the default location set in the file path listed above.