To download How I Met Your Mother Season 1 legally for offline viewing, you can use major streaming services with "download" features or purchase the season from digital storefronts. Legal Streaming (Download for Offline Viewing)
If you already have a subscription to these services, you can download episodes directly to your mobile device or tablet using their respective apps. How I Met Your Mother Download S1
: Available in select regions outside the US; mobile users can download episodes for travel or areas with no internet. Disney Plus Digital Purchase (Permanent Ownership) To download How I Met Your Mother Season