First, Uinstall the Shoppica2 Beta module from the admin -> Extensions->Modules. Then, select the default opencart theme.

Then, remove these folders

tb_themes
tb_extensions
catalog/language/english/tbspecial
catalog/view/theme/tbspecial

Also, remove these files:

admin/controller/module/tbspecial.php
admin/language/english/module/tbspecial.php
catalog/language/english/tbspecial

Now you’re ready to install Shoppica2 Final.