You can try a working demo at this link -> https://www.pos-tpv.com/demo17sat/control/
This plugin is not encrypted, so it is modifiable by a developer.
PLUGIN INSTALLATION METHOD：
To install the plugin it is necessary to follow the following steps:
1- Download the plugin and unzip the file.
2- Move the folder to modules/tpvtienda/plugins.
3- Once the plugin is in the correct folder, it is necessary to Activate it. To do this, go to Module Manager> look for "POS" and select CONFIGURE.