While you are looking for version 7.2.1 (released circa 2019), the developer strongly recommends using the latest version for security patches and bug fixes.
iSpy 7.2.1 Portable update, released in May 2019, offers a lightweight, "no-install" version of the world's most popular open-source video surveillance software. This version is particularly useful for users who need a surveillance server that can run directly from a USB drive or a temporary folder without modifying system files. Core Features of iSpy 7.2.1 iSpy 7.2.1 Portable Is Here -File- 2019 Download