1. Make sure you're connected to the web;
2. Run CSDS2;
3. From the main menu, select 'System | Upgrade program from web'.

--------------------------------------- <> If for some reason you don't connect your CSDS2 computer to the web, or have other issues, you can try the following steps:

1. Get CSDS2 version 2.28 here...
   https://www.ceder.net/csds2/csds2_2.28.exe

You need to replace your current csds2.exe file with the one above:

2. Run CSDS2;
3. Select 'Help | About Csds2';
4. Press the 'Open EXE Folder' button;
5. Close CSDS2;
6. In the file explorer window opened by step 4 above, rename csds2.exe to something else, just in case this rocedure fails. e.g., csds2old2.27.exe;
7. Open web browser, and go to https://www.ceder.net/csds2/csds2_2.28.exe;
8. Save the file to the opened folder. Make sure to save the file as csds2.exe, not csds2_2.28.exe;
9. Right-click on the downloaded file, and select 'Properties'. Make sure 'Read-only' is not checked. Additionally, there might be some other attribute such as 'downloaded from web' or something like that. I forget the exact name. You should also turn that bit off. I think there's a button or something to do that nearby.
10. Double-click on the csds2.exe file to run it. You should now have version 2.28. If a virus scanner or such pops-up, you may need to tell it that the file is okay.

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If you still have issues, you will have to uninstall the version you have, then re-install a later version.

The latest FULL version of CSDS2 is always located somewhere on this page: https://www.ceder.net/csds2/

E.g., the current FULL version is csds2publish225.zip You would be expected to download, unzip it, install it, run it, then proceed as given in the first set of instructions above. I.e., 'System | Upgrade program from web'