Installer(.exe or .msi): .exe
License type(Free, Trial/License code): Community edition
Studio/Robot version:Studio 18.4.0
Current behavior: Activation failed error
It seems like you have already installed enterprise version.
Now you are installing community version.
After installing Enterprise version uipath does not allow to install Community version
Refer the below link
Nope, i installed only community edition (trial version).