SSL enables browsers to communicate with a web-server over a secure channel that prevents eavesdropping, tampering and message forgery.  You should always use SSL for login pages where users are entering usernames/passwords, as well as for all other sensitive pages on sites (for example: account pages that show financial or personal information).

Configuring SSL on Windows with previous versions of IIS has been a pain.  Figuring out how to install and manage a certificate, and then associate it with a web-site, is something I bet most web developers don't know how to enable.

Source: The RIGHT way to enable SSL on MOSS Web Applications

1. Verify that the values under HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders use valid drive letters.
2. If there are invalid drive letters, change them to point to valid drives. 
3. Try to install the software and check if that helps.

That’s it! We appreciate your feedback! Please share your thoughts by sending an email to support@mscrm-addons.com.

· Open your CRM
· Go to Settings in the navigation at the left
· Select mscrm-addons settings from the navigation
· Click on the Dashboard row at the right grid and open it.  

Figure 1: mscrm-addons.com settings

In an IFD Environment it is hard to implement a FileShare which is available through the Internet. We found a product named WebDrive where you could configure, for example an FTP which will be mapped to a local drive.

Here is a link to the product website: http://www.southrivertech.com/products/webdrive/winindex.html

CTI does need the server component in a hosted environment as well, but you can launch the CTI Server setup from any Client, as long as you have a user with full access to CRM.

You need to select the hosted options on the Connection dialog. 

Basics:

License-checks are done each time the application is accessed by a user.

Having an invalid license stops the whole product from working.

An invalid license will never have any impact on Dynamics 365, it only limits the addon itself.