diff --git a/KeyProc.cpp b/KeyProc.cpp
index d76f675..be60572 100644
--- a/KeyProc.cpp
+++ b/KeyProc.cpp
@@ -20,6 +20,7 @@
 #include "LockId.h"
 #include "Obfuscate.h"
 #include "/EgtDev/Include/EGnStringUtils.h"
+#include "/EgtDev/Include/EgtNumUtils.h"
 #include "/EgtDev/Include/EgtBase64.h"
 #include "/EgtDev/Include/EgtCrc32.h"
 #include "/EgtDev/Include/SELkKeyProc.h"
@@ -37,13 +38,20 @@ MakeKey( int nProd, int nVer, int nLev, int nExpDays,
          unsigned int nOpt1, unsigned int nOpt2, int nOptExpDays,
          const string& sScramKey, string& sKey)
 {
+  // sistemazioni per nuova versione mensile valide fino alla 2806
+  // ( 2201->22, 2202->23 ... 2212->33, 2301->34, 2302->35 ... 2312->45)
+   if ( nVer > 22  &&  nVer < 100)
+      return false ;
+   int nVerY = ( nVer >= 100 ? nVer / 100 : nVer) ;
+   int nVerM = ( nVer >= 100 ? Clamp( nVer % 100 - 1, 0, 11) : 0) ;
+   int nVerNew = Clamp( 22 + 12 * ( nVerY - 22) + nVerM, 0, 99) ;
   // inizializzo parte pseudorandom
-   srand( nVer + nLev) ;
+   srand( nVerNew + nLev) ;
   // preparo la stringa da criptare
    string sClearKey ;
    sClearKey += ToString( ( rand() % 9), 1) ;
    sClearKey += ToString( nProd, 4) ;
-   sClearKey += ToString( nVer, 2) ;
+   sClearKey += ToString( nVerNew, 2) ;
    sClearKey += ToString( nLev, 2) ;
    sClearKey += ToString( ( rand() % 9), 1) ;
    sClearKey += ToString( nExpDays, 6) ;
@@ -104,6 +112,13 @@ ReadKey( const string& sKey, const string& sScramKey,
            ( ((unsigned char)sClearKey[23]) << 16) | ( ((unsigned char)sClearKey[24]) << 24) ;
    if ( ! FromString( sClearKey.substr( 26, 6), nOptExpDays))
       return false ;
+  // sistemazioni per nuova versione mensile valide fino alla 2806
+  // ( 2201->22, 2202->23 ... 2212->33, 2301->34, 2302->35 ... 2312->45)
+   if ( nVer > 22) {
+      int nVerY = 22 + ( nVer - 22) / 12 ;
+      int nVerM = nVer - ( 22 + 12 * ( nVerY - 22)) ;
+      nVer = nVerY * 100 + nVerM + 1 ;
+   }
    return true ;
 }