Installation photoshop elements 2020 error code 127

[#1]

My daughter purchased Adobe Photoshop Elements 2020-we have had installation issues from the getgo. I am on computer 3 a macbook pro trying to download and I keep getting error code 127. I have tried the online support and can't figure it out, I tried to start a chat with no response, and tried to find a contact number but it says it is not available without a paid plan or the latest software which I have and registered the product, but still no call number provided. I am at a dead end and about to return the product. Any suggestions that might help? Thanks in advance. 

[#2]

My daughter purchased Adobe Photoshop Elements 2020-we have had installation issues from the getgo. I am on computer 3 a macbook pro trying to download and I keep getting error code 127. I have tried the online support and can't figure it out, I tried to start a chat with no response, and tried to find a contact number but it says it is not available without a paid plan or the latest software which I have and registered the product, but still no call number provided. I am at a dead end and about to return the product. Any suggestions that might help? Thanks in advance. 

[#3]

What do you mean when you say you are on computer 3?  You can install the program on 2 different devices (but only use one at a time). 

I know nothing about macs, but do you have any anti-virus program on your computer?  If so, try disabling the anti-virus while installing.