I'm glad you were able to work around the issue. Thanks for that update.
If you had installed the beta, the beta installation first tries to extract the files to a location such as this: C:\Program Files\AdminStudio Setup Files\AdminStudio 10.0
If you want to install the final released version of AdminStudio on that same machine, you'll need to uninstall the beta. It is also recommended that you delete the AdminStudio 10.0 folder and its contents from the above path.
If not, it is possible that you may run into the issue that you described. When the installation tries to extract the installation files to the above location, it may have trouble overwriting the existing files.
I just wanted to add that we had this same issue. It seems to be a lack of quality control on the part of Flexera. I opened a support issue, and was told "we're seeing a lot of this". I was then given the ftp link to download the uncompressed files, which finally worked. You would think someone would test this out before delivering.