Can't get into my MultibitHD wallet. I have the 18 recovery words but can't recover the wallet
Since MultiBit HD uses BIP 39 for its "wallet words" (everywhere else these are known as the mnemonic or the seed phrase), you can import them into any wallet that supports BIP 39 mnemonics.

I suggest that you import your mnemonic into Electrum. Note that by default Electrum does not use BIP 39 nor does it use the same BIP 32 derivation paths as MultiBit HD.

To import, download Electrum and create a new standard Electrum wallet. Choose the option for "I already have a seed". Then enter your seed phrase. Before clicking "Next", click the "Options" button and in the pop up dialog, choose "BIP 39 Seed". On the next page where it asks about derivation, delete everything in the text box and enter exactly m/0'. Continue the rest of the wallet setup as normal. In the end, you should have an Electrum wallet with your MultiBit HD seed phrase for the private keys. You should see your Bitcoin in your wallet now.

Here is a video produced by MultiBit that shows this entire process.