I was using SquirrelMail and the Sieve plugin avelsieve for quite a while. And I once made the commitment on the mailing list to do some further development on avelsieve to make it work with newer PHP versions and fix other problems. The result was my own little update and some not yet released stuff that I only used myself.
But things changed and I moved on to Roundcube. And more importantly the spare time that I could spend on this project got less and less. I am really sorry, but I won’t be doing any further development on avelsieve. For anybody who wants to use my patched version, it is still and will be up there for download.