SEDNTERP version 3 installation issues
If you get error messages during installation, try installing again under Administrator privileges (right-click on the installation program file, and choose 'Run as Administrator').
This SEDNTERP version requires prior installation of version 4.0 (or higher) of the Microsoft .NET framework, which in turn means it will not run under Windows XP. Version 4.x of the .NET framework will always be present under Windows 8 or Windows 10, but might not be installed for Windows 7 or Vista. If the needed version of .NET is not present when you run the SEDNTERP 3 installer, it should try to download and install it from the Microsoft website.
SVEDBERG & DCDT+ installation issues
Remember, these programs require version 3.5 of the Microsoft .NET framework to be present on the installation computer prior to their installation. If you are running Windows 10, where .NET frameworks are part of the operating system, you will want to check whether .NET 3.5 has been activated before you try to install the program (see instructions below). If needed, the program installer should detect this (before it does anything else) and try to open a Microsoft web page from which you can download and install it before the installation continues, but it may give an error message instead. If so there is a local copy of the .NET 4.0 installation package here, or this link should take you to the correct MS download page.
If you are unable to download the normal installation executable file (dcdtinst.exe for DCDT+, svedinst.exe for SVEDBERG), possibly the download is being blocked due to security settings for your network or your own computer. If so, you can try downloading these .zip archives, dcdt+_install_exe.zip or svedberg_install_exe.zip, instead. Those .zip archives simply package those executable files.
Generally you will want to do a 'For everyone' installation. Other users on that computer will be able to run the program from restricted or non-restricted accounts.