Upgrade Instruction for CAVS RS Client program 1) Download the latest program file cavsrsiifull23.apk into E-Songbook. If you download the cavsrsiifull23.apk file into a Windows based laptop/PC, then the name of the file may have changed to cavsrsiifull23.zip. Be sure to change the name of the file back to cavsrsiifull23.apk before transferring the file into E-Songbook. To see the full file names in Windows, go to Control Panel > Folder Options and uncheck the option: Hide extension for known file type. 2) Using the File Explorer or Downloads in the E-Songbook, locate the cavsrsiifull23.apk file and tap on it to start the installation. 3) If a window for Replace application pops up, press OK to replace the previous application in the E-Songbook. 4) Next tap on Install to begin the installation. Tap on Done to finish. 5) Confirm the successful installation by going to the Program page and start by pressing the CAVS RS icon. *If the activation is requested to start the program, pleaes contact techsupport@cavsusa.net with your E-Songbook purchase record and the system id indicated on the activation request page. END