What is TechTool Deluxe.app and is it safe to download on my Mac?
What is TechTool Deluxe.app and is it safe to download on my Macbook Air 13?
Thank you!
It's junk you do not need.
... is it safe to download on my Mac?
"Safe" connotes different things to different people. Read Effective defenses against malware and other threats - Apple Community. If you don't need it, it's junk.