Dear David,
Thank you for your report.
I am very sorry to hear about the problem you are suffering.
I am also sorry to have to inform you that this forum is not the right place to report or discuss this.
Please note that this discussion forum is dedicated to programming Revit using the Revit API.
Therefore, you cannot expect an answer to a question such as yours relating to installation, product usage or end user support issues here.
You should try one of the non-API Revit product support discussion forums instead for that:
The people there are much better equipped to answer your question than us programming nerds.
I hope this clarifies.
Thank you for your cooperation and understanding and sorry I cannot help you myself.
Best regards,
Jeremy