Sorry for the delayed response and inconvenience caused. Can you let us know more about what’s happening? Are there any specific error codes or messages?
Try using a different browser and download PDF files, and see if this brings any difference. Would you mind sharing a screenshot of the error/issue you are facing, to share the screenshot, please refer to https://forums.adobe.com/docs/DOC-7043#jive_content_id_How_do_I_attach_a_screenshot
To view PDF files on a browser, you may refer to Display PDF in browser Adobe Acrobat, Acrobat Reader
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Let us know how it goes and share your findings.