Hi, and welcome to the forum.
It sounds like you have a faulty download and need to re-download the file.
There are 2 ways to do it.
1.) Download it using the link provided in the purchase confirmation mail.
2.) Go to the main Reallusion home page, Log into your account and re-download the file from the purchased products list.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.