Using version 7 implies using software that has not received security patches for many years. Vulnerabilities in the audio parsing libraries could theoretically be exploited if the TTS engine processes maliciously crafted text strings or input files.
Loquendo TTS 7 is a professional-grade text-to-speech engine often used for high-quality voiceovers. While "cracked" versions are often sought online, these versions frequently face stability issues, particularly on modern Windows systems.