Good morning everyone!
FWIW: If my theory is correct, TCL v1.x through 4.x will LIKELY all be put to memory lane (End of Life) in the near future; first, because their repository layouts differ in structure from that of their newer siblings of 5.x and newer. Secondly, most of the hardware that was supported in 1-4 is still supported in 5.x and many of the newer releases, and improvements, security enhancements, etc. are always a consideration. Finally, the older releases are merely taking up space that very, very few users visit so we can definitely use the extra space they're currently taking up with their associated cob-webs! @Curaga has been sparingly shutting down one of these antiques per year giving users ample time to make backups, upgrade, etc. This process should be ALMOST effortless for most people as users who are still running v3.x for example, are likely running it on non-internet based equipment which doesn't require updates as there haven't really BEEN any updates in quite a few years.
With a little patience... there's wondrous things on the white-board slated for year's end, 2025...
Stay Tuned.
Stay Positive.
Do Good Things!