Well, I hope this attempt will be more successful..
You can download it using ChessOK Downloader. The resource is /Aquarium/AquariumUpdate, as usual.
The download size is 15.5 Mb.

The update is cumulative, it means that it doesn't matter what version you've got, your Aquarium will be updated to 3.0.7.

The incremental update (3.0.5 to 3.0.7) is here: /Aquarium/Incremental Updates/3.0.5 to 3.0.7 (7 Mb). You can also find the old updates in the /Aquarium/Incremental Updates folder.

HTTP links:
Full update: http://www.chessok.com/download/Aquarium/Aquarium307Full.exe
Incremental update: http://www.chessok.com/download/Aquarium/Aquarium305_to_307.exe

For German version:
After installing the update, delete the file <Aquarium>\Aquarium.ger-rs-map

What's new: (also available in the Aquarium FAQ)

Major Features
=====
* CDP, CBH, PGN, EPD databases can be opened now as main database without conversion.
* Added printing and web publishing.
* Added the 'Match name' field for engine and human matches.
* Added possibility to view ECO index for position and game.
* Included possibility to enter Chess960 position into the Setup Position dialog.
* Added possibility to limit opening book to certain number of moves.
* Engine may resign now when playing against human.
* Smart input now works in Play mode.

Minor Features
=====
* Added option for check '+' display in notation and tree window
* ECO is now automatically set when the game is saved.
* Tree utilities program now informs about failed operation.
* Added support for additional NAGs in PGN.
* Clock now starts after the engine is initialized in engine games.
* Sorting by engine name in the Engines list is now case-insensitive.
* Engines are now sorted by name in various combo boxes.
* Tree configurations are now sorted by name in various combo boxes.
* Creating a tree configuration after 'Build tree' now sets Main tree and Discarded tree.
* Added common NalimovCache setting.
* Aquarium now remembers whether you wanted to send an error report or not, so you won't have to uncheck the box every time.
* Added possibility to perform game analysis and find blunders over a set of games in CDP/PGN databases.
* 'Paste' option moved outside the 'Copy/Paste' group in the Notation popup menu.
* Search current cell now works for all database types.
* Aquarium detects whether the engine can play Chess960 and doesn't allow playing against non-Chess960 compliant engine.
* Backspace button during tree browse now removes the move from notation if it's possible.
* Added possibility for multi-select engines in the tournament dialog.

Major Bugfixes
=====
* Fixed ''Subtract' and 'Compress' operations in TreeUtils - they were completely broken.
* Fixed crash when starting game analysis of a game from the reference database.
* Fixed engine crashes when analyzing certain Chess960 games.
* Fixed incorrect PGN NAG handling.
* Fixed occasional problems with converting PGN databases.
* Fixed crashes in Header searches in CDP databases.
* Fixed 'focus stealing' by sampled search display that led to troubles with move entering.
* Chess960 positions can now be found in databases.
* Fixed occasional huge numbers in the position counts in IDEA.
* Fixed 'Join' operation in TreeUtils that worked incorrectly in some cases.
* Fixed inability to enter Chess960 castlings under Smart Input.
* 'Save' button in Sandbox no longer removes the game header.

Minor Bugfixes
=====
* Fixed crash after removing the active tree configuration.
* Fixed excessive move display when switching from Rybka3_Hash configuration to another one.
* Fixed incorrect game name display when viewing first game in reference database and then clicking 'go to previous game'.
* Removed occasional appearance of 'fmRPlayMain' in the Task bar.
* Fixed occasional comment disappearing in PGN reading.
* Fixed crash when exporting to the opened database.
* Fixed incorrect marking of the first and last move during Ctrl+Home and Ctrl+End in game list.
* Fixed empty analysis display when PV contains Chess960 castling.
* Removed possibility of entering negative hash size.
* Zero move time in engine matches is now reported in the game (as [%emt...]).
* Clicking on 'Database' when no database is opened now displays an open database dialog.
* Fixed occasional disappearance of mouse pointer during header editing.
* Fixed occasional crash when setting up Header search.
* Fixed erroneous arrow display when adding an Area color marker.
* Promotion moves e8Q are now written correctly as e8=Q when exporting to PGN.
* Zappa doesn't crash now: unsupported UCI commands are no longer sent to the engine.
* Fixed a bug when annotations disappeared from some database games.
* Fixed CBH year and rating searches.
* Fixed CTG incorrect handling when there are '.' symbols in the file name.
* Fixed occasional incorrect work of the Hash size setting.
* Removed invalid moves from CTG display.
* Fixed memory leak when adding/importing several hundred engines at once.
* Fixed missing SetUp and FEN fields for engine games started from non-initial position.
* 'Copy Marked' now works for Reference database.
* Fixed crash when attempting to 'Mark range' with zero lower bound.
* Save as new base now allows EPD database type.
* Fixed browsing the list of all games of an engine match/tournament.
* Fixed crash when attempting game analysis of a newly created game.
* Fixed crashes caused by irregular PGN: 1. e4 ( 1. d4 ( 1. Nf3 ...
* Fixed graphical glitch when switching to next/previous game.
* Fixed crash when clicking Shift+Down with the last game of CDP database selected.
* Fixed incorrect date when exporting EPD as PGN.
* 'Copy marked' from Reference database doesn't include 'GameNo' field into the resulting PGN.
* Fixed occasional 'Invalid variant type conversion' errors during Game analysis.
* Ctrl+Click now marks correct game in non-DSN databases.
* Fixed rare crash when resizing main Aquarium window in Engines mode.
* Hash browsing now works when you switch to Rybka from another engine.
* Hash browsing now works in IDEA.
* Changing font size in notation has effect now.
* Fixed inability to switch color in Chess960 game.
* Fixed occasional bug that caused position search to display a list of empty lines.

What's next:
We are going to start working on a 'serious' feature upgrade. We'll work into several (or all) of the following directions:

- IDEA improvement: more control over stages and move priorities, parallel processing with several single-core engines, displaying current analysis, saving analysis queue etc.

- Delayed analysis: integrate EPD processor into Aquarium, display & control the positions to be analyzed, manage source & destination files, evaluation import etc.

- Play mode enhancement: save current game when exiting, allow game adjourning, exclude observer engine, allow playing from any position. Possibly even merge Play and Sandbox.

- Learning features: detecting blunders in own/database games and using it in training, opening repertoire training, opening exploration courses etc.

- ChessOK Downloader and Uploader: chess data sharing, more convenient installers, etc.