Installation failure due to java file

[Lakeside]

I downloaded a free version in the Spring, and today purchased the newest version from Amazon. Could not get it to install. Got this message half way through:
C:\Program Files\Sweet Home 3D\jre8\bin\javaw.exe
An error occurred while trying to rename a file in the destination directory:
MoveFile failed; code 183.
Cannot create a file when that file already exists.
Click Retry to try again, Ignore to skip this file (not recommended), or Abort to cancel installation.
When I clicked abort, it gave a short message that it was rolling back the changes. But then I couldn't open my old version because it said it couldn't find it. I tried:
- uninstalling the old version
- re-installing the new version (free)
- re-installing the new paid version
- updating Java (already had a version of 8)
Could I make another folder to install the program into? Maybe another drive such as D?
Thanks for any suggestions you may have.

[Puybaret]

I would first reboot to unlock everything and try to install the program again as administrator if possible. Then if this doesn't work, theré's no problem to install the program elsewhere. If it was an issue, the installer wouldn't let you change the installation directory!
By the way, Sweet Home 3D installer comes with its own private copy of Java, so updating the Java version you installed separately won't change the behavior of the program.