Dear Artem,
thanks for reporting this.
Seems that spatialreference.org admins recently made some changes to their server, which now requires additonal certification, ooof.
I will try to fix the WKT components asap.
In the meantime, you can still get the WKT strings for each spatial referance system manually at https://spatialreference.org/ref/.
Just find the CRS you need and open the ESRI WKT definiton (as ie. here) and use them in the same way as you would use the WKT components output.
Best, Ondrej