This is the most crucial aspect of your request.
Run the MSI interactively for full control: telerik justdecompile offline installer link
If you downloaded a Trial or Commercial MSI by mistake (e.g., from the Telerik UI bundle), you’ll be prompted. The free JustDecompile MSI should not ask for a key. If it does, you have the wrong file. Re-download from the free product page. This is the most crucial aspect of your request
Progress Software (owner of Telerik) still maintains JustDecompile, but the free edition is no longer a priority. Most active development focuses on their commercial decompiler inside Fiddler Everywhere and Test Studio. The standalone free JustDecompile receives only critical updates. Or with a specific installation directory: msiexec /i
If you need an offline installer for a specific version (e.g., 2020), your best bet is to ask on Telerik’s official forums or support if they’ll provide a legacy link. Sometimes support will give you a direct URL if you explain a valid use case (air-gapped network, corporate policy). They are surprisingly helpful when you don’t ask for a crack.
You can deploy JustDecompile across your organization silently:
msiexec /i "JustDecompile_2024.2.14.0.msi" /quiet /norestart
Or with a specific installation directory:
msiexec /i "JustDecompile_2024.2.14.0.msi" INSTALLDIR="C:\Tools\JustDecompile" /quiet