Windows 8 can handle dx9 calls differently between x86 and x64. When we fixed Windows 8 64 bit crashing it inadvertently broke the 32 bit version. I stayed up pretty late last night revamping the entire hook process even further to be more robust across all platforms. It's not done yet, but when it is it will be a much nicer experience for everyone-- Windows 8 included.
For now you can roll back to https://tracker.recursion.tk/files/RTST0910.msi which should work, or even further back https://tracker.recursion.tk/files/RTST0902.msi (this version requires an uninstall of the current one)
As soon as the new version is finished you will be able to update it through the normal process.
And again, thank you everyone for your feedback and support.