Instead of using the installer, AcousticSamples libraries can be downloaded as RAR files from the page Downloads/Serials on your AcousticSamples account.
Once downloaded you can then extract the RAR file with WinRar (Windows) or The Unarchiver (Mac).
You will get a UFS file that you need to put in the following default locations:
Macintosh HD/Library/Application Support/UVISoundBanks (on Mac)
C:\Program Files\UVISoundBanks (on Windows)
After that your soundbank will appear in UVI Workstation's Soundbanks list.