Install old emscripten version. How?

[bogong]

Hello!
I've been updating system and got this message at time of compilation:

:-1: warning: This Qt was built with Emscripten version 1.38.27. You have 1.39.11. The difference may cause issues.

How to downgrade current ./emsdk to 1.38.27
I've been trying to get on off-site, but got failed. There are pretty documented only using last.

[lorn.potter]

The wiki has updated instructions for the new emscripten labels:
https://wiki.qt.io/Qt_for_WebAssembly
./emsdk install sdk-fastcomp-1.38.27-64bit
./emsdk activate sdk-fastcomp-1.38.27-64bit