If you have ms-office 2003/2010/etc, then use test database .mdb.
For modern ms-office, use accdb (remove .mdb-file, unpack accdb from the archive).

To use access db from odbc, you should have odbc driver installed.
If not, download it from microsoft (AccessDatabaseEngine.exe or AccessDatabaseEngine_X64.exe). If your system is x64 but you have ms office 32-bit installed, then _X64 version would not like be installed without reinstalling ms office to x64 version, BUT THEREFORE it is possible to install it. Unpack the installer (it can be opened with WinRAR), and run setup (ACEredist.exe) with the key /passive, and it will install. (To run it with the key, it is possible to use command line or just make a shortcut to exe and append the key /passive just right to the exe name in the shortcut properties sheet).

Also take into account, that it is necessary to include the path \4MDB first, to provide Str_sql functions generating strings without N prefix (in other SQL's this is necessary to ensure that sql strings are unicode).

Some tests want to work with odbc connection named Students, other - Student64. See FUNCTION Connection_string in corresponent Test_db_AAA.al4 file.

Still some fields were added later and could not be added to the release version of the database, add these by yourself opening .mdb or .accdb file in a constructor mode.

For now, c++ still could not work with ms access database. Nor OTL neither DatabaseLayer (this last seems to be very out of date and probably dead). Did not yet test OTL with other database engines, may be it fails only with ms access.

Vladimir Kladov, 2017, 14 August. 