I have found a few links that explain the DRM implemented in both games with great detail, and that allow for anyone to patch their games with a browser utility.

Seems to work for me though I've only tested Javelin (Summer), Speed Skating and Ski Jump (Winter).

Explanation - https://mrwint.github.io/winter/

Patcher - https://mrwint.github.io/winter/patcher/index.html

This is great!

But in light of that, question arises for @blue ones & @GOG:
Could you, please, implement it into your build of game?
Game is unplayable without this, you should definitely contact the guy who did the patch and implement his changes into the game.

Thanks for the heads up, had a quick go on speed skating and it appears to be working.

Thank you for the info, OP.