You can find the latest downloads on Sourceforge.  It is recommended that everyone upgrade to the latest version for maximum compatability.

Here is the complete Changelog:

Changelog for 1.7.5 (since 1.7.4) ===================================

[BNCHAT]
-- fixed win32 specific problem (can't read while writing)

[D2CS]
-- reduce enforced maxchar value down to 18 (fixing possible
problems when having many chars with long charnames)

[WAR3]
-- wins required for specific chat icons now also configurable
via anongame_infos.conf (previously only affected profile icons)
-- discard games with no winners at all

Changelog for 1.7.4 (since 1.7.3) ===================================

[SC/BW/W2BNE]
-- write a message to creators/joiners of ladder games of alternative types
(those specified with "ladder_games" in bnetd.conf)
-- adder "ladder_prefix" to allow only matching game names to be counted as
ladder games for the alternative ladder game types
-- fixed ELO calculation for top-vs-bottom team ladder games

[D2DBS]
-- changed codes to use the common network API for send/recv on sockets and
error checking thus hopefully fixing bugs of not ignoring properly some errors

[BNETD]
-- made difficulty of a closed D2 game known to bnetd
-- various clan related bugfixes
-- enforced max password length (was creating problems in some cases with
very long passwords)

[MISC]
-- lots of optimizations (lowers CPU footprint)
-- improved win32 winsock error reporting
-- fixed many clan code related crashes
-- optimized plain file account loading

Changelog for 1.7.3 (since 1.7.2) ===================================

[D2CS/D2DBS]
-- fixed problem with d2cs and d2dbs not exiting when exit signal is
received and exit_time has expired

[FDWATCH]
-- fixed a bug which created problems with some backends because of reused sockets
not being cleaned properly

[STAR/SEXP/W2BN]
-- fixed problem with topvbot "team game"-results being discarded
-- fixed possible overflow with malformed gamereport packets

[D2DV/D2XP]
-- added workarround for D2 classic client side bug
(open bnet games being listed as closed bnet games)

[MISC]
-- made topics.conf being reloaded on SIGHUP
-- made '/games all' display clienttag of a game
-- fixed problem with language specific channels with limited user count

Changelog for 1.7.2 (since 1.7.1) ===================================
[WIN32 GUI]
-- fixed problem with running d2cs & d2dbs as services (gui versions)

[D2CS]
-- The backup copy of the charsave file and charinfo file are now deleted
when client deletes one of thier charactars

[MISC]
-- fixed problem with language specific channels
-- added UNIX build configure options to disable bnetd/d2cs/d2dbs builds
-- added "sync_on_logoff" bnetd.conf directive to enable saving of account
data on user's logoff
-- fixed crash with short/broken cdb user files
-- fixed trying to load invalid usernames (like "")

ChangeLog for 1.7.1 (since 1.7.0) ===================================

[FDWATCH]
-- redesigned and rewritten most of the fdwatch codes (the new codes are now
called fdwatch2) to better support OS which have sparse values for sockets
(ex. this should help busy WIN32 systems)

[STAR/SEXP/W2BN]
-- fixed problem with topvbot game-results being discarded

[DEV-C++]
-- fixed compilation problems

[D2XP/D2DV]
-- added "Diablo II Level 100 Workaround" for mods with a max level
greater than 99. Option in d2dbs.conf to activate.

ChangeLog for 1.7.0 (since 1.6.2) ===================================

[D2CS]
-- made ordering of chars on char-selection screen configurable
-- fixed "d2cs not trying to reconnect" issue
-- made sure maxchar limit for an account is enforced
-- added WIN32 GUI feature

[D2DBS]
-- fixed "deleted a ladder char and created one with the same name
breaks the ladder" problem. If your ladder is broken, delete it.
If your players want their chars to stay in ladder they shouldn't
delete them cause new chars with same name will remove the old entry
-- added WIN32 GUI feature

[STAR/SEXP/W2BN]
-- changed handling of gameresults to be democratic
-- fixed problem with win/games ladder

[STAR/SEXP]: fixed "v1.11 can't play ladder games"-problem

[IRC] major cleanup of handle_irc.c
-- hiding IP on channel join/leave to non admins when hide_addr=true
-- now on IRC channel topics are supported (at least their output)
-- PvPGN can only handle being in one channel at once, so the server
now makes sure you leave the channel you were previously in.
-- added /NOTICE, /ISON and /WHOIS handling
-- now the real MOTD displays when connecting via IRC
-- allow changing /nick before login
-- allow another try on a wrong /msg nickserv identify
-- added passfail count to IRC connections to prevent bruteforce logins

[D2]
-- added the option to supply norm, night, hell to /games d2xp command
for finding a game of a specific difficulty.

[WAR3]
-- droped <1.13 support, added 1.15 support (CG,PG,AT, clan profile view)
-- added code to detect the right w3routeip if is set to 0.0.0.0
-- redone major parts of the AT code (old AT teams will be lost)

[LADDERS]
-- added .dat/.xml ladder output for STAR/SEXP/W2BN rating based ladder
-- moved textual ladder files from ladderdir to statusdir

[PREFS]
-- fixed handling of comments (previously it skipped the whole line no
matter where '#' was)

[FDWATCH]
-- removed useless template usage because events field is r/o for pollfd
structs

[MISC]
-- updated autoupdate with latest clients versions
-- fixed "message_cache_lookup: unsupported connection class" errors when
broadcasting message (ex /ann) and having any connection different than
irc/telnet/bot/bnet (ex d2cs etc)
-- added client, version and country info to the /finger command
-- added clan and clan rank info to the /finger command
-- added option to bnmotd.txt to display info about new mail
-- adjusted /whois command to be more like on battle.net
-- massivly renamed configuration files so each has an extension
-- added scripts/pvpgn_hash.inc.php so everyone who needs has a php-
implementation of the commonly used passhash algorithm
-- fixed problem with topaz-chat (and maybe other clients, too)
not propperly displaying tmpOP on initial channel join
-- adjusted friends/watch game/server join/leave message to be more like b.net
(changed message type from info to whisper)
-- fixed channel behaviour to now really allow a common channel for all clients
(different shortname, same special name)
-- changed all 4 bytes tags (clienttags, archtags, etc) to use internally
integers for comparations instead of strings
-- changed almost every place where sending username to send the logged in
username (if differs in case) than the account username (this fixes some bugs
like modifying some account data when logged in with different case and also
gets us to closer Battle.net behaivour)
-- added /moderate command to moderate/unmoderate a channel