Pricing can vary, and the best place to check is the official Synthesia website or authorized retailers.
Files ending in .exe that claim to patch software are the most common delivery vehicles for malware. Because these programs must interact with your system at a deep level to modify other software, they often require you to disable your antivirus or "Run as Administrator." This grants the file full permission to:
: You can also buy Synthesia from authorized retailers, both online and in-store. This provides another layer of assurance that your purchase is legitimate.