If you already have the offline installer, you can keep using it indefinitely, but you can no longer download it from the official Telerik site .
Excellent for both decompiling and debugging .NET assemblies. dotPeek: A free standalone decompiler by JetBrains. JustDecompile FAQ - Telerik
So why choose Telerik JustDecompile over other decompilation tools on the market? Here are just a few benefits: