Hello,
I was using a fully crypted disk under Yosemite with various Encryption Desktop version up to now 10.4.1 (490).
No problem at all, a pop up is asking for passkey.
I did not upgrade because Encryption Desktop was not compatible.
I upgraded rescently to Sierra (fresh) no installation problem.
I no longer get the pop up I am getting an other one from sytem saying that my disk is not readable.
I found no way to mount the disk.
What can be done to fix the problem? PGP disk is only proposing to create a new disk or encrypting a disk.
For the moment, I steped back to to Yosemite from a backup and then it work again.