If it's a trial, you need to email sales@ to get a re-issue. If it's a paid license you need to re-issue it at the provider if they allow it.
If you use Blesta or LC it's on Manage (in the services box) and then re-issue.
If you have the domain and say blesta in a folder it will work fine. I have Blesta installed in Billing, and the site in the root domain and it works fine.
The Blesta api file needs to be in the Blesta folder, which it looks like it is, so are you using a control panel, if so which one? Blesta should be on the same account as your website, but it doesn't look like it is, but a subdomain.
ok comment them both out and try your blesta, try it with http:// see if it redirects to https:// if so you are using HTST
If it fails try:
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteCond %{SERVER_PORT} ^80$ [NC]
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
If that fails try:
RewriteCond %{HTTP_HOST} ^(www\.)?domain\.com [NC]
RewriteCond %{REQUEST_URI} ^/ [NC]
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^(.*)$ https://domain.com/$1 [R=301,L]
replacing domain.com with whatever your blesta is e.g.:
RewriteCond %{HTTP_HOST} ^(www\.)?licensecart\.com/billing/ [NC]
RewriteCond %{REQUEST_URI} !^/dl.php [NC]
RewriteCond %{REQUEST_URI} ^/ [NC]
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^(.*)$ https://licensecart.com/billing/$1 [R=301,L]
If it's none of them I'm out of ideas.
You can just download the files and move them there, and download and restore the database. Then you need to edit the root urls in the setting database so the files link up and finally re-issue the license key.
It's common sense Major.Minor.Patch Patch is for patches if there's bugs.. Then you have the major.minor, 3.6 is the last in the 3.x versions therefore it's 4.0.0 and it's down to that time they have to get 4.0 out since they already have planned the tasks for 4.0 and it does a lot of work preparing for 4.1 where the domains is going to be revamped which a lot of people need.
it's not hard to void invoices I've been doing it since 3.0 when people don't pay so I know what you feel but it's not the end of the world whilst we wait for it.
Won't be in 3.6.1 that's a patch release, the next release is 4.0.0 and it depends on if they have time left to do some small tasks after the main ones.
As long as it's bootstrap / pure CSS it's just a integration. We've made some pre-made themes for both standard and Blesta CMS you can find them on the Blesta marketplace, and thread in these forums.
Sorry I couldn't fix it with you mate, we tried the support_manager files we use at LC and still got that error so I believe it's cPanel myself but the guys will be able to help you if they can shortly.