It was hard to find, but in the end I found a download:
http://support.guptatechnologies.com/supportwiki/index.php/SQLBase_Driver_Packs
To get the result, you should query your favorite search engine for "SQLBase Driver Packs" instead of ".NET Data Provider". The installer contains the ODBC / .NET / OLEDB and JDBC drivers.
However, I could not connect to my database in any way, because the installer (I tried installing 9.0.1 and 10.0.0) was broken.
Failed to get 10.0.0 to work, but for version 9.x I manually copied these files:
- SQLBaseUtil.dll - MFC71.dll - msvcr71.dll - msvcp71.dll
from the installation path to my system32 folder. This worked for Windows XP and Windows 7, but for Windows 7 I also needed to determine the path to the ini file in the connection string:
var connectionString = "data source=ISLAND;" + "uid=sysadm;pwd=sysadm;" + "ini=C:\\Program Files\\Gupta\\SQLBase901\\sql.ini";
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