2) Remove the Program Files CodeGear RAD Studio 5.0 directory. This is Borland Delphi 7 Enterprise Edition. A serial number that worked for me is: Serial Number: 6AKD-PD29Q9-RDF?JQ-X65Z Authorization Key: QX8-EEC (yes, that is a question mark in the serial) This lets it install, but then it bitches about registration. Delphi ds150e diagnostic tool with delphi 2015 release 3 download software new release now. 2015.3 Delphi ds150e new vci package with no delphi 2015.3 keygen, customers need send delphi 2015.3. I have downloaded the community edition for Delphi RAD Studio 10.3 and was sent the email with a serial number to register it with. When I submit that serial number, I'm told that no valid serial number was found. I've tried the advanced registration options with the same result (which is seen in the image I've provided).

If you still love to developing with Delphi 7 and you're using Windows 7. Here's the tricks on how to install it.
Delphi 7 serial number lookup
1. Make sure you run the install.exe as Administrator.
2. Ignore the compatibility issue and run the program.
3. Install Delphi 7, by click on it.
4. After installation finishes, don't run Delphi yet.

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Because it will pop an error message like this. And it will pop the error message whenever you want to start a new application.
5. Now go to C:Program Files (x86)Borland (assuming you are using Win7 64bit)
And right click on Delphi 7 Folder, choose Properties. Uncheck Read-only Checkbox and click apply.
6. Next, click the Security Tab, click on Users, and click Edit button to change the permission for user to allow full access...
check the Full Control and Modify checkbox, and click the Apply button.
7. Click OK button, to close it. And you can run the Delphi 7.
If Delphi 7 still pop up the Incompatibility Issue message, Just click the Don't show this message again checkbox and run the program.

The installation of Delphi 7 is now finished.

Delphi 7 Serial Number

If you are having trouble of using Delphi 7 Winhelp. Please read next solution to fix delphi 7 help system.