To download from the official CyberLink website:

While CyberLink PowerDVD 7.3 was a landmark product, it is now considered legacy software. Cyberlink PowerDVD 23 Ultra - Overview - Ashampoo

holds a sacred place in digital media history. It was the software that turned your standard PC into a high-definition home theater, complete with DTS audio and pristine DVD upscaling. It represents a time when physical media was king and software had to fight for every frame of video quality.

Released in late 2006 and peaking with update 7.3.3730 in 2007, CyberLink PowerDVD Ultra Deluxe arrived at a pivotal time for home theater PCs (HTPCs). This was before Blu-ray won the format war against HD DVD, and it was certainly before 4K streaming.