just installed sellacoius on Joomla 3.8.12 with following stats:

• php: Linux res216.servconfig.com 3.10.0-714.10.2.lve1.5.12.el7.x86_64 #1 SMP Fri Feb 2 00:27:48 EST 2018 x86_64
  
dbserver: mysql
dbversion: 5.5.5-10.2.12-MariaDB-log
dbcollation: latin1_swedish_ci
dbconnectioncollation: utf8mb4_general_ci
phpversion: 5.6.37
server: Apache
sapi_name: cgi-fcgi
version: Joomla! 3.8.12 Stable [ Amani ] 28-August-2018 14:00 GMT
platform: Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
useragent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

When trying to view in the admin, the following error is generated:

Error 403 - Forbidden

You don't have permission to access the requested resource. Please contact the web site owner for further assistance.

Any help would be appreciated.
Thanks,
Jim