If you encounter difficulties downloading and installing ACDSee Ultimate via the web installer, you can download the full installation file directly, and then run it to start the installation.
Please note that ACDSee Ultimate is a 64-bit version only.
Following are the download links for the full installation file:
ACDSee Photo Studio Ultimate 2021
ACDSee Photo Studio Ultimate 2020
ACDSee Photo Studio Ultimate 2019
ACDSee Photo Studio Ultimate 2018