If you have VDownloader 0.2 uninstall it. (Delete FFMPEG, Readme, & VDownloader.) After that you can download version 0.21!
1. First off, save this thing called
Vdownloader.
2. Unzip the contents and extract them.
3. Run FFMPEG first. A command prompt should pass quickly. You only need to do this once.
4. Find the video you want on Youtube.
5. Find the permalink:
6. Copy that link.
7. Run Vdownloader.
8. Paste the permalink in box.

And then click OK.
9. Pick the format you want.
10. When you save the file
don't forget to add .avi or .mpeg at the end file name.
11. Click OK.
12. When the downloading is complete you should see your file in where you saved it.
You could do this with Google Video. Same concept except the permalink is the link you see in the adress bar. You may need to convert the avi in order to see it.
After getting the video you can convert it into mp4 so you can watch on your PSP!
(By the way I didn't make VDownloader!) If you can read spanish, visit the developer's website
here.
If you had problems with the VDownloader, download it again.