Not sure if posted before but will post to help others.

Clamcoin Windows 10 client seems to have some bug that prevents it from synching by using the instructions by the post https://bitcointalk.org/index.php?topic=623147.msg9772191#msg9772191

The bug appears if you have your Windows 10 machine connected to the Internet while extracting the bootstrap.dat file. It reaches the maximum of 750 orphaned blocks very soon and just stalls and refuses to continue adding more blocks to synch even though the full height contained by the bootstrap.dat file has not been reached.

Solution to this is to download that full bootstrap.dat file, put it in the same directory as the wallet.dat is and then disconnect from the Internet.

After that reopen the Clamcoin client and let it have a clean block extraction while been cut off from the Internet and no orphan blocks appear.

On OSX there does not seem to be similar orphaned block problem while extracting the bootstrap.dat file while been connected to the Internet and extraction works as expected.