I have an upgrade version of 5.3 that I purchased when it was released. Haven't used for sometime but was going to install on a new computer in my office so I could update some existing Clipper apps. Since it was an upgrade I installed Clipper 5.2 with no problems, but I can not get the Windows version to install, I get an error message <br>(The application program you selected is not a valid copy .<br>The installation cannot complete. <br><br>Any suggestions.<br><br>Also does anyone know where I can still buy Clipper if need be I will buy a new CD, I still need this to maintain so old apps.<br><br>Thanks<br><br>Atlas<br>