Webmail Blank Page

I have version 0.9.8.151, after this last update the webmail stopped working.

Try installing it via manual by following this guide:
https://blog.bullten.com/upgrading-roundcube-in-centos-web-panel/

And it gives me the following error:
[root@vps roundcubemail-1.2.3]# bin/installto.sh /usr/local/apache/htdocs/roundcube
PHP Fatal error:  Class 'PEAR' not found in /tmp/roundcubemail-1.2.3/program/lib/Roundcube/bootstrap.php on line 103

I need a solution please, I have the PRO version of CWP.

As I see there is missing PEAR class in the /tmp/roundcubemail-1.2.3/program/lib/Roundcube/bootstrap.php which has nothing to do with CWP as far as I know.
P.S.
With RoundCube personally I`m using also AfterLogic and RainLoop web mails. RoundCube and AfterLogic for users and RainLoop for me(because I like it more the way it looks). Go on their pages and you will find very useful and easy install instructions and scripts. Best wishes.