Prerequites and recommended components for Oracle JDeveloper 12c (126.96.36.199.0) Windows (includes JDK 7) installation are available for downloading in the table below. For the install guide and release notes see JDeveloper's Documentation page.
Prerequites and recommended components for Oracle JDeveloper 12c (188.8.131.52.0) Generic for all the platforms (without JDK 7) installation are available for downloading in the table below. For the install guide and release notes see JDeveloper's Documentation page.
I have just downloaded latest 4.1.3 version with jdk included - Windows 64-bit with JDK 8 included to my Windows Server 2008 R2 64-bit and faced the same problem. Could not start sqldeveloper.exe, because "msvcr100.dll is missing from your computer".
For me the solution was to simply upgrade SQL Developer. When work changed over my laptop I copied SQL Developer between machines and I got the above error except for msvcr120.dll. I copied that dll from my old machine but then it needed another and then another. So I downloaded the latest version of SQL developer and the errors went away. It might not solve the issues for everything but I think updating to the latest version should be done before trying any of the other solutions.
From there you can download an extension and install it in JDeveloper from the local file. When you download an extension make sure to load the right version as you can only install extensions which are configured for your version (check the min and max version of the extension!).
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