Higher Education Institutes (HEIs) have been met with an unprecedented demand on their student counselling and wellbeing services in recent years with the impacts of COVID-19 and high rates of mental health concerns amongst student populations. Online mental health programs offer one solution by providing students with quick and easy access to effective therapeutic content. The Focused Minds Program is an evidence-based eight-module online self-guided cognitive behavioural intervention that targets the transdiagnostic risk factor of perfectionism and has been shown to decrease depression, anxiety, and disordered eating. The program was implemented at a UK university between 2021 and 2023. Recruitment occurred via departmental emails, academic staff, and the university's counselling staff and website. Participants were provided with access to the intervention for 6-weeks and completed weekly surveys of psychosocial measures. The trial's implementation was assessed using the Reach, Effectiveness, Adoption, Implementation, and Maintenance framework: reach (uptake via the recruitment channels), effectiveness (outcomes on psychometric measures of mental wellbeing), adoption (staff and organisational support), implementation (intervention engagement and attrition), and maintenance (continued implementation across the trial period). Key barriers to successful implementation, as well as proposed solutions, are discussed to guide future online mental health interventions provided in HEIs.