O well. Here is the deal. I've down loaded the dnn 4.2. Unpacked it, put in iis local host, opend it in vs(beta version). Did all the configuration with the web.config file and sql. Crt+F5 in vs. And I've got an error Error 1 Unrecognized attribute 'requirePermission'. Note that attribute names are case-sensitive. (G:\Inetpub\wwwroot\dnn\web.config line 6)  

But in this web.config file there is alitel note

<!-- the requirePermission attribute will cause a syntax warning - please ignore - it is required for Medium Trust support-->

So I stuck on this.May be there is a way to change the trust support? May be vs betta not good enough? and need to get full releas? Put some ideas and some help please.