My lightroom photos outgrew my harddrive wich made me switch to "dont save my photos locally" for a while. Then I got a larger drive and decided it is safer to have a local copy of my files. Sadly now lightroom is incapable of downloading my files again. When I start up lightroom it says:" moving your photos" and then " checking photo 1 out of 106540" then the count runs about to 8900ish and freezes. I have to press "stop until next start" whereupon nothing is saved locally. If I manually click a photo it will download it, but for example flagging it or giving it a star does nothing. I would like to download my photos in bulk, since clicking all my 100000+ photos and waiting for 2 secends while they download, seems like unnecessary work.
If this is indeed the cloud version of Lightroom, you should be able to delete the local library (normally in your pictures folder) and have it redownload. What you describe sounds like a problem with the local copy of the lightroom library. Then setting it to locally store images after it has recreated the local library should make it download all images. Might take a while depending on your internet speed.