Recently Galaxy tried to update The Witcher 3, downloaded a patch slightly bigger than 100 mb and when installing it, it get's stuck on moving 99.4%.

If I close and reopen Galaxy, it will either restart the patch from the download or continue stuck on that percentage.

Ocasionally it will stop, claiming a broken installation. Telling it to verify/repair just get's it back to the stuck moving problem above.

So.. how do I solve this without uninstalling and reinstalling everything?

Well, I ended up uninstalling and redownloading/installing the whole game again. It solved, but would be nice to see a solution that was less drastic.