We recently updated the single large 12k zip and instead created a set of six 2GB zips that we think will solve your bandwidth issue.
Please follow these steps:
1. Log into your customer area here.
2. Download all 6-12k Zip files.
3. Extract the first zip with a zip utility such as 7-zip or WinRar (the others should extract automatically).
4. If using with HDRI Link please see HDRI Link installation training.