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Theodore Peirce BaehrTheodore Peirce Baehr 

Unable to install from AppExchange

What's the deal?
Any idea why this is happening and how to fix it: 
  • So far, I'm the only sys admin of our new org.
  • The System Administrator profile has permission in Profiles > System Permissions to "Download AppExchange Packages". 
  • Yet, I'm getting the warning "Problem Logging In: We can’t log you in because of an authentication error. For help, contact your Salesforce administrator." If you want a pretty picture:
 Pretty pic of warning I'm getting: "We can’t log you in because of an authentication error. For help, contact your Salesforce administrator."

Thanks in advance for any ideas! 
Running Salesforce Lightning in Chrome 54 on macOS 10.12 aka Sierra.
Theodore Peirce BaehrTheodore Peirce Baehr
Curiouser and curiouser - I do not have the problem in Safari. 
Why would I have the problem in Chrome? 
sfdcMonkey.comsfdcMonkey.com
hi Theodore Peirce Baehr
i also face same issue in past
clear your chrome browser cache and cookies onces and try again . now you can log in successfuly in appExcahnge 
thanks if my answer helps you mark it best answer so it make proper solution for others in future :)
Theodore Peirce BaehrTheodore Peirce Baehr
Thanks piyush_soni. I missed your reply earlier. Funnily enough, I was trying to solve this problem again(!!) when I came across my question and your answer. So thanks, for last time and this time. ;)