Incentivized by the announcement of a new TrackMania last week I just wanted to play a little TrackMania² Canyon. Unfortunately, however, upon launching the game through Maniaplanet I was prompted to install all the latest updates, which keeps failing with the following error:

Is there any way of fixing this issue?
Some (maybe useful) additional information: my computer is running Windows 10 Professional x64 1909 on an Intel Core i7-3770, 16GB of system memory and an AMD RX580 8GB. I bought TrackMania² Canyon on Steam.
Please help me!
Cheers,
Daniel