Photos won't download original pictures to Mac
I've recently done a clean install on my Mac and having issues with Photos app. I've not backed up my old photoslibrary file, assuming I would be able to download it again after clean installation, before formatting everything was synchronizing properly. After, when I open Photos app, make it system library and enable iCloud Photo Library, Photos start to download thumbnails; but after all images are added to my library it won't download original files. Status is stuck at downloading 37,000 something and won't proceed.
I've tried leaving it overnight, but there is no network activity. I've also tried deleting .photoslibrary file and starting from scratch, also logging out of iCloud and back in, rebooting in between, it all ends up with same result.
If I select a random image, it will download original as it does on iPhone/iPad with optimized library.
There are many Photos related errors in system logs, many from 'cloudd' or 'photolibraryd' processes. Seems like an issue with these supporting background processes but I don't have any idea how to fix those.
Any help is appreciated, thanks.
MacBook Pro with Retina display, OS X El Capitan (10.11.5), Photos app on my Mac.