They have a DVD here:

https://www.yesasia.com/global/akumu-no-elevator-japan-version/1021866320-0-0-0-en/info.html

It doesn't look like it has subtitles in English though.

There seems to be a dubbed version here:

https://www.amazon.com/Elevator-English-Subtitled-Seiy%C3%B4-Uchino/dp/B00724XSOM

It says it's not available in this region though.