Translation to Spanish of Ultimate Member v 1.3.88

I installed the v 1.3.88 of Ultimate Member. It also states: “Your site language is es_ES. Good news! Ultimate Member is already available in Spanish language. Download the translation files and start using the plugin in your language now. Hide this notice” Clicked on download but nothing happened.
1. Link to the page where can I download the .mo and .po files of the Spanish translation?
2. The directory to locate the files is [wp-content / languages / plugins] or is it another?
Please, can you help me? Thanks