Can you send us that file "lib.blib"?
You can upload the file here:
https://skyline.ms/files.url
I think that error might be happening because Skyline is trying to put more than a few hundred million items into the same list in memory.
This limit is not really related to the amount of memory in the computer. In the C# programming language that Skyline was written in, lists are not allowed to contain more than a few hundred million entries, so, in the places where there might be more things than that, we need to make sure Skyline spreads the entries across multiple lists.
After we see your library it will probably be straightforward for us to fix this.
It is always very informative for us to see very large datasets like this and we usually find many more things that can be improved in Skyline.
-- Nick