Hi there,
First question:  I currently have Logos 3, but I am switching from my PC to a Macbook pro.  What do I need to do in order to make this work?  I am really hoping that I don't have to buy the software again but can just exchange the license and make whatever necessary changes.  I'm still fairly new to Logos and completely new to Macs so I would appreciate some straightforward, easy-to-follow advice.  
Second:  In the occasion that I do not need to buy new softward and can continue using my Logos 3...  I'm just curious, is the difference between Logos 3 and 4 that great?  Is it worth upgrading?  To be honest, I've found Logos in generral somewhat cumbersome and not as helpful as I was hoping it would be for the money.  I have the scholars gold edition; I feel like it should be more helpful than it is.  Is Logos 4 a great improvement?  And particularly as it pertains to Macs?  
Thanks for your help!
Jill