I'm disappointed that this issue persists for our designers. I understand the temptation to share, as some files can become corrupted or a hard drive fails. I was devastated a few years ago with just such an issue, and I lost some of Amber Shaw's kits that I absolutely love. I also lost an alpha set that I used for years and cannot replace.
BUT these kits are someone's way of feeding their families, and even more so, they are ART. Someone took the time and creative energy to make them.
Please just do the right thing so we don't discourage our designers.