Hi @rockmachine
sorry about the late reply, I was only notified of your latest post for some reason.
I can run Scaler in Reaper 64 on Windows 10 here on my test machine.
I would advise to try uninstall any previous version of Scaler and maybe even search for any remaining files on your disk (search for “scaler” and “scaler_x64”) and delete any previous version that could still be present.
Then restart your computer and run the latest installer (1.6.1) using the default settings.
In case you don’t have the latest Windows updates from Microsoft, I would suggest looking at this thread as some users have run into issue because of a missing update and it can be resolved by simply installing a package from Microsoft: FL Studio Plugin Manager - “error” - Windows 10
Let me know if this helps with your issue, and sorry again for not replying to your original thread.
Cheers,
Ed