Hey, @Bia_Romani4269. Welcome to the Lightroom Community. I'll help you figure this out.
I've tried downloading many images from Lightroom Web simultaneously as ZIP in Edge, & Chrome, and it worked as expected. What browser & type of files are you attempting to download? Has this started to happen since a recent change in your Browser or files imported recently?
Thanks!
Sameer K
(Type '@' and type my name to mention me when you reply)
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