Fool proof install - step by step

WTF!?

With the step by step guide i reached the login screen two days ago. Today I wanted to create a company, but i only got a time out message. Now i burn down the house!!!

The error is shown in Setup Wizard Request Timeout - Problem Solution - #2 by revant_one or Time out error for creating new companies - #9 by Ahmed.Khater or [Solved] Setup failed >> Could not start up: Error in setup - #2 by pipech.

Unfortunately all named solutions, time out 6000 or bench update --patch or many tries didn’t work for me.

The log of Google Chrome is

request.js:274 SyntaxError: Unexpected token < in JSON at position 0
at JSON.parse ()
at Object.frappe.request.report_error (request.js:408)
at 500 (request.js:187)
at Object. (request.js:267)
at i (jquery.min.js:2)
at Object.fireWith [as rejectWith] (jquery.min.js:2)
at z (jquery.min.js:4)
at XMLHttpRequest. (jquery.min.js:4)
(anonymous) @ request.js:274

Please, can anybody help for the last steps? Thank you.