WLAN stick with lack oats instructions, not for Win 8.1

Installation works as described in the instructions. But what in the manual is missing: Who will replace an old drive (for Windows 8.1 needed) should first remove the old drivers (simply start the old installation software and select Uninstall, then the computer restart). This will be developed for the old sticks no newer driver I find it questionable, but this policy matches the support that is rotten and useless. This gives only a mail that refers to websites with tips that you have already found themselves and applied. Therefore, only four stars (I was merciful because of my many years of positive experience with AVM, three star would not otherwise have sufficed).

Addendum: Under Win 8.1 the stick breaks down after a short time. (I do not now happened twice). Have checked with AVM: Problem is known remedy not yet available (?). Am therefore resorted to a andres product.
Downgraded to 2 Star.