01-15-2014 11:07 PM
Hi and Welcome to the Community!
I have Error 545 message on my screen
Here is a KB that discusses that error:
Hopefully it contains something useful! There also are multiple existing threads on this site that discuss that exact error...your review of those might prove useful, and a search of this site, using the error message, error code, or symptom, should reveal all applicable existing threads to you.
have tried to download Desktop manager to my Mac but it will not download says I need 10.6
Not at all sure why you tried that, given the KB recommendations, but whatever...compatibility requirements are what they are...there's nothing anyone here can do to change them. To use the Desktop Software, you have to be running a computer that is compatible, which yours is not.
Good luck and let us know!