Where can i download the version 1.1.8 of the plugin?

I have a website we have to give maintenance now, and it comes with this plugin, but customized, and based on the version 1.1.8. Unfortunately, the previous developer doesn’t have a backup of the vanilla plugin, just the modified version.

Now we need to update the plugin, but we cannot identify the modifications in the code made by them without access to the original code.

Where can we download the version 118 of the plugin?

Thanks in advance.