You can use this method to download a group of files from OneDrive.
I am using Internet Explorer 11 in this example.
First, browse to the level above the folder you want to download. In this case, I'm downloading an example folder I shared between accounts.
If you want to download the entire folder, you can hover over the blue square for the folder and click the checkbox:
If you want to pick specific files, click on the folder. When you're in the folder, hover over the files you want and click their corresponding checkboxes.
In both of the above cases, a Download button will appear after you check the first item. Once you're done checking the items you want to download, either the whole folder or individual files, you should click the Download button. In IE, a yellow ribbon should appear across the bottom of the window.
Click Save. You can note the name of the zip file you're downloading listed on the bar.
After the download is done, click "Open Folder".
A Windows Explorer windows should arrive. The zip file should be highlighted already. You can right-click on the file and use 7-zip to extract the file to a folder.
When that's done, a folder should appear in the list. If you chose the option similar to the one circled above, it will be named the same as the zip file without the .zip extension.
You can browse into the folder, and the files you chose should be in there.
Hope that helps!