There may not be a definitive answer to this. The reason given by your device was that the download was corrupted, hence it refused to install the first few times.
As for obtaining future firmware for download, updates are announced at facebook.com/hibycom and there they do post links on google drive for the new firmware to be downloaded. Hope that helps.
Thank you for your reply. I do not have Facebook but, from what I have seen, it is openly accessible, and the links too, so that is great!