It is sufficient to
- Stop Web Dispatcher,
- rename the old Executable directory e.g. from exe to exe.old
- Create a new executable directory exe,
- Download a new version of SAPWEBDISP.SAR to directory exe,
- use SAPCAR to extract the binaries, e.g. ../exe.old/SAPCAR -xvf SAPWEBDISP.SAR
- if you are running Web Dispatcher with SAP Start Service, restart the SAP Start Service,
- Start Web Dispatcher
This procedure will be sufficient even when updating from an older release to a newer release of Web Dispatcher.