I downloaded GPO4 last night and got an error message:
The file 10_Asus_a_f_73_A3.xc.data is missing. Please reinstall. (Strangely, the next dialog says "Installation cancelled!" ,then "Sounds of ARIA Player(GPO_STB) install failed!" but then continues to complete the install anyway and shows a big green tick, saying the installation was successful. WTH...??)
I had read some other threads where they were told their download was corrupt and to download again, so I have downloaded again, and got exactly the same error. The install continued tonight as it did yesterday, with the same results: Open the ARIA player, and find that no brass or woodwind will load. Strings and Steinway are fine.
Comparing both days' downloads shows the mpkg and SamplesData folder are both exactly the same size (25,241,882 and 1,006,418,337 bytes each respectively).