I have a problem trying update my old version software developed in c51

I have an old version of c51 where I develop an application. I want to use a newer version of this compiler (c51), I want my old version to compile in the new version of c51. How can I make this work...
I have a problem trying update my old version software developed in c51

I have an old version of c51 where I develop an application. I want to use a newer version of this compiler (c51), I want my old version to compile in the new version of c51. How can I make this work...
Updating to MSK-ARM version 4.70

Hi all, I have updated to MDK-ARM version 4.70 but nothing seems to be changed in uVision... After installing, I restarted my computer. I search for code completion configuration (uVision Help...
Updating to MSK-ARM version 4.70

Hi all, I have updated to MDK-ARM version 4.70 but nothing seems to be changed in uVision... After installing, I restarted my computer. I search for code completion configuration (uVision Help...
Keil Update for Free 32K Limited version

Is there an update path from the Keil 4.70, free/32K limited version to a code limited version of 5.17? Normal Keil download is requesting a non-existent license number...