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1ea7e45a1f
If the `releases` directory exists, but still only a subset of the necessary previous release binaries are available, the test fails by throwing an exception (sometimes leading to follow-up exceptions like "AssertionError: [node 0] Error: no RPC connection") and printing out a stack trace, which can be confusing and at a first glance suggests that the node crashed or some alike. Improve this by checking and printing out *all* of the missing release binaries and failing with an explicit error in this case. Also add an info on how to download previous releases binaries. Noticed while testing #30328. Can be tested by e.g. $ ./test/get_previous_releases.py -b $ rm -rf ./releases/v28.0/ $ ./build/test/functional/wallet_migration.py