[Tex2002ans]

As KevinH has said, a while back, FlightCrew changed into a Sigil Plugin.

* * *

To install the new plugin version of FlightCrew:

Step 1. Go here:

https://github.com/Sigil-Ebook/fligh...ases/tag/0.9.2

and download the ZIP file for your operating system (Windows, Mac, Linux).

So if you have Windows, download the file:

• FlightCrew_v0.9.2win.zip

Step 2. In Sigil, press Edit > Preferences > Plugins.

Step 3. Press the Add Plugin button on the right side:



and select the ZIP file you just downloaded.

(In this case, wherever you put the "FlightCrew_v0.9.2win.zip" file. It may exist in your Downloads folder.)

After you add it successfully, FlightCrew should appear in your list:



Step 4 (Optional). After FlightCrew is installed, you can assign FlightCrew to one of Sigil's "plugin buttons".

Press the "Shortcuts" tab.

Then click the dropdown for "Plugin 1:" and select FlightCrew:



Step 5. FlightCrew can now be found under Plugins > Validation > FlightCrew:



Or, if you followed Step 4, you can press the "Plugin #" button you assigned:



(In this case, the "Plugin #1" button will act like the old "checkmark" button in older versions of Sigil.)

* * *

Side Note: I would also recommend installing Doitsu's EpubCheck plugin for Sigil.

FlightCrew is great for catching some basic errors, but epubcheck is the actual tool that's used by the vendors to make sure EPUBs are compliant.

Doitsu's plugin lets you easily run epubcheck within Sigil in a "FlightCrew-like" way.

All you have to do is download his ZIP from that MobileRead thread, and install it using the same steps as above.