Hi
Sorry for the delay in answering your post.
From the errors described in the second document, there are 2 troubles here:
1. It seems that it had troubles registering a .DLL file in your T:\ drive. This is a non-standard directory which may be why it had failed as typically AccountRight is installed on the C:\. This DLL file is used for BASlink which is the "File Manually" option in the Prepare BAS button of AccountRight, this won't hinder other operations of the software however.
To get this one fixed, normally we recommend reinstalling without any software blocking the installation, and attempt to install on C:\.
That being said, it may still operate correctly without that .DLL file as I'm not too sure what that exact file is for and may be able to not use it.
2. That second warning at the end shows that it couldn't start the Server Service in Windows, it is unrelated to the first issue and can be fixed rather easily.
If you haven't already, you just need to follow this support note: AccountRight server service issues
Please let me know if you have any questions, or encounter any troubles along the way.