For this build I rewrote Mirage source code to previous version of Unity. To the same version that was used in Mirage 0.3 in a hope that it will fix a bug. I did it because users said that 0.3 worked but 0.3.5 - does not and one of the major differences between releases was an upgrade and code rewrite to newer Unity version.
Also, to fix this bug I bought today a nine years old PC and tested this new build on it - Mirage works there.
That machine has:
* GeForce GTX 650 (2GB RAM)
* Intel Core i5-3470
* 8GB RAM
* 500GB almost dying HDD
* Windows 10 Pro
Please report if this hotfix helps.