avast!4 engine library 'libavastengine.so.4.1.10' is not installed!

But I have installed it! I’ve extracted the tar to my /root/ directory, then ran:

# bash /libavastengine-4.1.10/install_so.sh
accepted the default settings, then

# bash install.sh

which gives me this error:

[i]avast!4 engine library ‘libavastengine.so.4.1.10’ is not installed!

Run ‘./libavastengine-4.1.10/install_so.sh’ script to install it![/i]

Using Redhat 7.3

comment line no.104 in install.sh file