flickr to dropbox to goog (googledrive and googlephotos) to yandex and other clouds migration without using any of your adsl bandwidth
You can use it without installing because it is a web app. Multcloud is a multiple cloud storage manager that allows users sync, transfer or backup data across different clouds, such as Google Drive, AmazonS3, Dropbox, Box, OneDrive, FTP, Amazon, etc., easily and freely.
if you want to download your flickr photos and migrate them to imgur you might find it easiest to use flickr organiser to create albums of 1000 photos each and download a zip of each album
if you try and download all 10,000 photos in one go you might get
We can only process albums with fewer than 5,000 photos.
Please use Camera Roll or Organizr to create smaller albums or to
remove photos from this one, then try again.