White page on install

I get to the choice of install or upgrade.
Install produces a white page. When I look in the "manage extensions" it lists
System - joomlamailer MailChimp Signup Site Plugin 1.3 2014-09-28 freakedout system 10151
MailChimp Stats Administrator Module 1.1 2014-08-16 freakedout N/A 10150
MailChimp Signup Site Module 2.0 2014-09-07 freakedout N/A 10149
Joomailer Mailchimp Signup Administrator Component 2.1 2014-09-28 freakedout N/A 10148
JoomailerMailchimpIntegration Administrator Component 2.0.8 2014-10-04 freakedout N/A 10147

But there is no listing in components in the back end and so no ability to use joomailer.
I have tried on a few sites, all with the same white screen on install and inability to use the product.
Please advise.
Kind regards...

Hello softforge,

There seems to be a fatal error during the installation (thus the white page). Please set the error reporting level in the global configuration to maximum and then try again to install Joomlamailer. Let me know what error message appears.

Kind regards,
Pete

Here too, it seems even though it said successful installation, the MailChimp component is not listed in the Admin, so I can not go there to do further changes or configuration.

I was able to get an API key and have put it into the field provided.

Attached a shot of installed and enabled components.

I have re-installed the component, then used UPGRADE and now it seems to work fine and the entry NEWSLETTER has appeared in the component section.

Thank you