If you already have a purchased license but lost the key, check your ESET HOME account or contact ESET support with your invoice.
Let me know if you need help applying a valid key through the ERA (ESET Remote Administrator) or cloud console.
Here’s a draft for a post or forum thread about I’ve written it in a neutral, informative tone — suitable for a tech support community or blog comment section. Title: Looking for an ESET Endpoint Security license key – legal options only
Sheffield Drainage