If you want to check the HANA database server version, please see this link, https://itsiti.com/check-sap-hana-version There are multiple ways of checking the HANA client version. You can follow the steps mention below,
Login to the SAP and from the top menu, go to System > Status. Click on Other Kernel Information (SHIFT + F5).
Alternatively, login to the SAP application server. Go to the WORK directory and look for any dev_work* files. You will find below information on HANA client version.
Loading SQLDBC client runtime (pid=12345)... SQLDBC Module : K:\usr\sap\SID\D00\exe\hdbclient\libSQLDBCHDB.dll SQLDBC Runtime : libSQLDBCHDB 2.02.064.1527184718 SQLDBC client runtime is 2.02.064.1527184718
you can also take a look at the “manifest” file in the hdbclient directory