RubyMine keeps reverting to RubyMine 6

I have a bizarre issue. I'm running RubyMine 6.3.3 on Mac OS X 10.11.1 El Capitan. Every time I upgrade it, it reverts back to 6.3.3

I upgraded it to a fully licensed RubyMine 8 earlier this week. When I launched it a second time, it had reverted back to RubyMine 6.3.3

I had previously upgraded at least twice to RubyMine 7, and both times it reverted to RubyMine 6.3.3

I also have WebStorm, and it's been perfectly happy to upgrade to latest and stay upgraded as latest (11.0.1).

What's causing RubyMine to downgrade on me?

I have a valid RubyMine 8 license/subscription.

Only reason I can think of is the System Integrity Protection (SIP) in El Capitan, but I don't understand why it would apply to something under /Applications

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