
Per my research, by default, SharePoint allow users to download previous versions through link formatting "https://<SiteURL>/_vti_history/[MajorVersion*512+MinorVersion]/<Library>/Document.docx", users only can open the latest version of file in the browser.
For prevent users download files, you could use conditional access policy to block download.
Reference:
For prevent users copying files, go to Library settings -> Information Rights Management.
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