You should not get this problem at all. If you got the "Cannot find pear on this server", please follow instruction here.

1. Locate php_bin

[root@local ~]# /usr/local/bin/pear config-get php_bin

usr/local/bin/php

2. Locate php_dir

[root@local ~]# /usr/local/bin/pear config-get php_dir

/usr/local/lib/php

3. Replace @PHP-BIN@ on the below commands with the result of 1. and @PHP-DIR@ with the result of 2. and run these commands.

@PHP-BIN@ -C -q -d disable_functions='' -d suhosin.executor.func.blacklist='' -d memory_limit=128M -d max_execution_time=3600 -d include_path=@PHP-DIR@ -d output_buffering=1 -d variables_order=EGPCS -d open_basedir= -d safe_mode=0 -d register_argc_argv=On -d auto_prepend_file= -d auto_append_file= @PHP-DIR@/pearcmd.php install -f /var/cpanel/rvglobalsoft/rvsitebuilder/scripts/RVSeagullMod-1.0.1.tgz

@PHP-BIN@ -C -q -d disable_functions='' -d suhosin.executor.func.blacklist='' -d memory_limit=128M -d max_execution_time=3600 -d include_path=@PHP-DIR@ -d output_buffering=1 -d variables_order=EGPCS -d open_basedir= -d safe_mode=0 -d register_argc_argv=On -d auto_prepend_file= -d auto_append_file= @PHP-DIR@/pearcmd.php upgrade -f /var/cpanel/rvglobalsoft/rvsitebuilder/scripts/RVSeagullMod-1.0.1.tgz

Watch the result of the command whether success or fail.

If you run into the problem, please submit support ticket including root access.