If you'd like to confirm that your downloaded zip files are not corrupt, then here are filesizes and hashes for the current (v1.5.1.2) Juicebox-Lite and Juicebox-Pro zip files.

Juicebox-Lite:

Name: juicebox_lite_1.5.1.2.zip
Filesize: 1,891,211 bytes
MD5: 7aea2fa3fe11019f0b0bd794c96ce85a
SHA1: 87b5da8cf23ef5b36a003468c8abc6037123166f
SHA256: 3a38333181f38806e18f45604e64fac067525f25c16fb836288160d145a5c7a9

Name: JuiceboxBuilder-Lite.air (v1.5.1.2)
Filesize: 1,386,533 bytes
MD5: c00e6323c08438f3fc069f10199e63f6
SHA1: 81f902352a1c077c653e61d9c46288723995c751
SHA256: 2ba340cbe7cc9824f5324bf6f238b194be17524e4a2cef71a9230d68578414ec

Juicebox-Pro:

Name: juicebox_pro_1.5.1.2.zip
Filesize: 1,907,008 bytes
MD5: 18dcb1666d93a4d24da1e7eff8138470
SHA1: 5b369b377a35293e9cd0055f622acb594eeddc2e
SHA256: 70cacb58d8d45fd347d599e4835d5dfec1c9ee9cf10786f5d7b2219e626acc4a

Name: JuiceboxBuilder-Pro.air (v1.5.1.2)
Filesize: 1,390,776 bytes
MD5: 6714ed9b9790beec4eb46dbe2000a656
SHA1: 0790b8df79efaf6f0b89624884252fd07001149e
SHA256: a26ff24c35c825e316ab7aa509d574dc6585d201da5260ab1df74a020315f591

[Edited 17 November 2023.]