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This thread is resolved. Here is a description of the problem and solution.
Problem: Il mio sito mi da questo errore: "Your PHP version is too old, please upgrade to a newer version. Your version is 5.5.38, Simple Tags requires 5.0.0. Remove the plugin from WordPress plugins directory with FTP client."
Solution: Per favore aggiorna la versione di PHP alla minima richiesta da WordPress e da WPML (al momento è 5.6 ma tra poco sarà 7.0)
Relevant Documentation: https://wpml.org/home/minimum-requirements/