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Researchers are studying post-traumatic stress disorder PTSD and complex PTSD CPTSD, which includes additional symptoms affecting self-organization. This study evaluates the feasibility and acceptability of trauma-focused cognitive behavioral therapy for complex presentations TF-CBT-CP delivered via videoconference to adults diagnosed with PTSD or CPTSD in community mental health services and hospitals in the Maule Region, Chile. The study is a pilot with a mixed design involving 13 adults to prepare for a larger trial in this population. Participants will receive TF-CBT-CP therapy consisting of 16 weekly 60-minute sessions delivered by trained clinical psychologists using videoconference. The therapy includes assessment, psychoeducation, coping strategy development, behavioral activation, emotional regulation and interpersonal skills, exposure to traumatic memories, cognitive interventions, and relapse prevention. Sessions and assessments will take place in clinical settings equipped with the necessary technology to ensure privacy and connectivity. Participants will undergo initial and follow-up evaluations via videoconference using clinical interviews and questionnaires assessing PTSD, CPTSD, depression, anxiety, suicidal ideation, substance use, emotional regulation, and functioning. Satisfaction with the intervention and reasons for dropout will be monitored. Feasibility outcomes include recruitment, retention, and treatment completion rates, while secondary outcomes focus on symptom reduction and psychological well-being improvements. Qualitative interviews will explore participant acceptability after treatment completion, with total participation lasting about 20 weeks.