Ok, I found a solution that worked for me.
1. Uninstall Adobe
2. Uninstall Adobe Cloud
3. Download and Run the Acrobat Cleaner Tool (Link)
4. Reboot your PC
5. Download the Acrobat Pro installer (Link)
6. Extract the folder
7. Inside the Adobe Acrobat folder, execute "setup.exe"
8. ATTENTION: On the first window, please click on "Customise".
9. Now click on "Optional Features" and select "This feature, and all subfeatures, will be installed on local hard drive."
Under "Optional Features", we have the "Preflight" option. So, Adobe will install the Preflight without a network installation.
10. After it, you can click on "Install".
This process worked for me on different PCs (Win10 and Win11 - both 64-bit).
Good luck to everyone!
Marcus Barros.