Login to DNN_Platform_18.104.22.1688-740 as host.
From PB, go to settings, Extensions.
Try to install this theme: 31095_0_Dixit_1.3.2_DNN6_DNN7_Install.
-From PB, go to manage>sites.
Click add new site.
Try to select the newly installed theme as default for your site from the site Templates list.
You will not find the newly installed theme in the list of site templates.
Newly installed templates should be allowed to be selected with site creation.
This is for all themes.
Please verify that this is not a required behavior before starting to fix it.
Central Jira Link: https://jira.devfactory.com/browse/DNN-16953