You can send to up to 250 recipients at a time for personalized links. If you're opting for a public link, there is no limit on the number of people who can download your file.
How large are the files that you are sending?
The files range between 80,000 to 200,000 Kb.
As you can see from other postings on this forum, we're currently experiencing upload problems for very large files, especially over slower internet connections. I suggest that you try to upload these files to your account at https://cloud.acrobat.com and then create Public links from there. You can then distribute the Public links for your users to access the files.