The downloaded pack itselfs checks all the content of the data, to be sure there's no corrupt downloaded file, but the error while unpacking/activating is a more... possible situation. If the package succeeded it's own test, you don't have to redownload the mod file, never. But yes to delete, even from registries the mod and reintall it all, including the FLMM (for safety, it's just 2 mins more). Remember to add the mod as an exception of your AntiVirus program... as we noticed some rare AV del…