No worries, that’s what you’re here for 
Usually only the .0.0 versions are breaking changes. So 13.0.0 contained all the “woes” you have to pay attention for an upgrade.
If you used 13.0.0 before, you can directly go to 13.4.0 by just copying the files. You can then check for upgrade wizards and check the Database Compare tool for changes, but that’s all.
So in your case please just upload the 13.4.0 release files onto your setup. Then try to access the install tool. Sprint release before the 13.4.0 are usually for testing/developers. You might just have faced a bug in the “in-between” versions.