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> <br>(The application program you selected is not a valid copy .<br>The installation cannot complete. )<br><br>Am running NT 4.0 and the DOS version of Clipper 5.3 installed without any problems, I'm puzzled and need some help getting this windows version installed since I want to use the Clipper Workbench. <br><br>Thanks <br><br>Atlas<br><br><br><br>Any suggestions.<br><br>