ImageGlue 8.1 is supported on all Windows versions since Windows Vista.
During the 30 day trial period the software will operate as a Professional Edition. After the software expires you can convert it to either a Standard Edition or a Professional Edition by purchasing the relevant license key. The Professional license enables the embedded PostScript-compatible interpreter required for built-in EPS and PDF rendering functionality - this is not enabled in the Standard Edition. The Professional Edition is available in native 64 bit versions while the Standard Edition is not.
We would suggest that you uninstall previous versions of ImageGlue before installing this one.
We do not recommend that you download or use legacy versions of the software. It is important for security, stability and support that you stay up-to-date. If you have to use legacy versions then, with the above caveat, we will do our best to help you. However, our core advice will always be that you should upgrade.