Could someone finish uploading this dA artist's work? (I've been stymied)

edit: I went ahead and did it anyway.
 
I was just beginning to post the missing works by AngusDra from deviantArt when I noticed the uploader was not grabbing the full-res images available through dA’s “Download” links (and from discussion in the “site bugs” thread I’m not hopeful to see this working anytime soon.)
 
This artist posts a lot of very high-res images and there’s simply no way I’d be able to get it done with my year-2002-ish upload speeds.
 
[ >>2224290 needs to be reuploaded at full res from https://www.deviantart.com/angusdra/art/Aer-Swift-737330014 ]  
[ >>2224294 needs to be reuploaded at full res from https://www.deviantart.com/angusdra/art/Sirious-Fall-755222953 ]  
[ >>2224344 needs to be reuploaded at full res from https://www.deviantart.com/angusdra/art/April-786167569 ]  
[ >>2224346 needs to be reuploaded at full res from https://www.deviantart.com/angusdra/art/RainbowMelody-786574305 ]
 
Further images that I’ve checked haven’t been posted at the time of writing:  
[ https://www.deviantart.com/angusdra/art/Botany-755223618 ]  
[ https://www.deviantart.com/angusdra/art/Midnight-755276484 ]  
[ https://www.deviantart.com/angusdra/art/Rage-755722404 ]  
[ https://www.deviantart.com/angusdra/art/Colorful-756051337 ]  
[ https://www.deviantart.com/angusdra/art/Wlynx-757811254 ]  
[ https://www.deviantart.com/angusdra/art/Comm-Yoooo-761336085 ]  
[ https://www.deviantart.com/angusdra/art/Untitled-764735521 ]  
[ https://www.deviantart.com/angusdra/art/Soft-Sunlight-766902186 ]  
[ https://www.deviantart.com/angusdra/art/Aer-swift-775454842 ]  
[ https://www.deviantart.com/angusdra/art/How-to-play-guitar-786750600 ]  
[ https://www.deviantart.com/angusdra/art/Dash-in-light-795721527 ]  
[ https://www.deviantart.com/angusdra/art/Random-19-Another-boring-day-800047714 ]  
[ https://www.deviantart.com/angusdra/art/Sky-Blue-802743454 ]  
[ https://www.deviantart.com/angusdra/art/Queen-of-Equestria-807954667 ]
 
Special attention:  
https://www.deviantart.com/angusdra/art/Nightmare-819108667 is larger than 25600kB, what’s the preferred way to reduce such an image for upload?

@JustForUploading  
4 linked images (except the third — no download option available) updated
 

 
I personally use PNGOut. Sometimes it can take up to 1-2 hour to process especially large images, but usually it’s enough to reduce file size enough without losing quality at all. If it’s not enough, then converting to jpeg with maximum possible quality and then slowly reducing until meeting size limit.