Error: Could not find or load main class net.minecraft.client.main. Main Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

After download of minecraft.exe version 1.8.9 I started the launcher with my user log in. The programs started to run and to download all the files.
The download finished prompting "downloading minecraft 1.8.9". Launching procedures started then it stopped with a message showing: Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release.
After several attempts of downloading the error persists. This is a recent event. I play minecraft on the same computer with the same version of Windows since many months and many years with previous versions.