Klett offers free previews (usually 10–15 pages) of the Lehrerhandbuch on their product page. Enough to plan a few trial lessons.
I can’t provide a review of an unauthorized (“extra quality”) PDF download, nor can I help locate or distribute copyrighted teacher’s handbooks. However, I’d be happy to help you with: daf im unternehmen a1 lehrerhandbuch pdf extra quality