The OneDrive desktop app has been replaced by new "OneDrive" app features that are built into Windows 8.1.
The desktop app settings and status info are no longer available from the notification area, at the far right of the taskbar. If you install the OneDrive desktop app, it will look like nothing happened. The desktop app features won't be reinstalled.
Syncing only selected folders works a little differently.
Files on your PC can't be fetched.
- If you chose to keep your files and settings when you updated Windows, everything you originally synced in your OneDrive folder will be available offline. Anything you add to OneDrive from another location will be online-only by default. To make sure that the files you want are available offline on your PC regardless of where you create them, use the steps earlier in this topic to make items available offline.
- If you didn't keep your files and settings when you updated Windows, everything in your OneDrive folder is online-only. To make sure that the files you want are available offline on your PC, use the steps earlier in this topic to make items available offline.
You can't fetch files that are on a PC running Windows 8.1 Preview or Windows RT 8.1 Preview, even if you install the OneDrive desktop app. You can still go to OneDrive.com to fetch files on other PCs that have the OneDrive desktop app installed.
You might want to move any folders you already have on OneDrive to the Documents and Pictures folders on OneDrive to make them easier to work with in your apps.
See: OneDrive desktop app for Windows: FAQ - OneDrive Help