How to go from photos to videos?

I wonder if rather than downloading the OP means without having to process all the in between frames? Just creating the video with one image?
If so, then keyframes are what you need. One way wuld be to create two images - one at +5 exposure and one at -5exposure. Then create two video groups, with each image in its own group on the timeline. Then click on the chevron next to the name of the upper video group to open up opacity. Add an opacity keyfarem at the begining and one at the end. Go to the first (or the last, depending on which way you want the change to go) and in the layer palette alter the opacity to 0%. Then as the video plays the top image opacity will gradually change from 0% to 100%. 
Others may be able to tell you if there is a better way, a way you can keyframe the exposure directly.

If the images are sequentially numbered, you can import into Photoshop, Premiere Pro, or After Effects. 

Since this is the Photoshop forum, go to your images, select the first image, click Image Sequence, open, and select your frame rate.

You will get a video file. 

If the images are not sequentially numbered but in order, you can use Bridge's Batch Renaming to add it to the images. 

---

@defaulthed8zeycxr6a wrote:

Without downloading each individual image?

---

Where are the images now that you need to download them? On a website?

You would need to download them to your computer first to make a video in Photoshop, but once there you can load them into one file efficiently so you can make the video.

Jane

Do you have Premiere (Pro or Elements)?