I am sorry to have caused confusion. The key really is contained in this sentence:
The link does not relate to the installation as such. But: If you provide the link and possibly the exact filename (as there are sometimes more than one file contained in the same link), we can actually look at the file, if download speeds and file size permit even download the file(s) and troubleshoot with you. Needless to say, one of us might discover something that you have overlooked - we all make mistakes.
The biggest problem is that many files bear an almost identical name yet can be quite different in their installing procedures. Original files are often repackaged and repackaged and repackaged and you end up with a multitude of readme files within one package that can sound quite contradictory because hardly any of the "Repackagers" ever bothers to sort out that mess.
The idea is to get hold of the base model if it's still available, provide the link to it and then link us to the modifications or repaints or packages you intend to install.
Any more questions, don't hesitate to ask