Spring Tool Suite launch error - Java was started but returned exit code=13

If you clicked the download button on the Spring Tool Suite site it probably downloaded the 32-bit version (as the browser you used is, probably, 32 bit). I haven't found a way to determine which version you downloaded besides the name of the rar file

32 bits version file is named spring-tool-suite-3.8.4.RELEASE-e4.6.3-win32.zip and 64 bits is spring-tool-suite-3.8.4.RELEASE-e4.6.3-win32-x86_64.zip (notice the -x86_64 at the end)

So, in order to fix your issue:

1. Confirm that you are using 64 bit Java

   1.1 Start a terminal (cmd at Windows) and run java -version

2. Download 64 bits Spring Tool Suite manually from its download all versions page

3. Unzip

4. Execute $UNZIPPED_FOLDER/sts-bundle/sts-3.8.4.RELEASE/STS.exe

5. If everything goes ok mark this answer as correct ;)

I ran the same issue as you just an hour ago and that was the way I fixed it. For future downloads select manually which software version you want to download (as default selected will probably be 32 bits)