Like always, patches take some time, because they are made and tested by GOG .... usually about a week.

Changelog for Update 1.8.1-640R (added 10 December 2019):

Thank you for playing BATTLETECH! Release 1.8.1 is now available for users on Steam and GoG. Other platforms will release as soon as possible. The main areas of improvement are: UI, visual effects, and mod support. The previously released LBX2 ammo fix has been replicated across all platforms.

UI
- Fixed an issue where the weapon hover panel didn’t update COIL damage and heat correctly
- Fixed an issue where Thumper heat did not preview correctly
- Fixed an issue that caused a black screen to occur when loading a save after going bankrupt
- Fixed an issue where entering the Main Menu after bankruptcy did not end the previous session
- Fixed an issue where a black screen could occur if the Store panel was open while loading a save file or returning to the Main Menu and then loading another save file
- The “Mechwarrior Info Panel” no longer caps at displaying three as the maximum number of injuries

Visual Effects
- Rubble is now consistently applied when destroying buildings on urban maps
- Missile trail visual effects have been restored

Mod Support
- Fixed an issue where asset bundles were failing to load
- Fixed an issue with the Mod loader merging .csv files
- The overlay for save states made with mods is now present when mods are disabled or deleted
- Fixed an issue with loading external assets
- Fixed load ordering for DynamicEnum data
- Mods that fail to load now show up in the mod list screen
- Removed mods no longer show up as loaded on the mod list screen
- Mod dependencies are now multilayer aware
- Mod loader logging is now on by default
- Note the updates to the mod support readme on our forum:
-->WIN: C:\Users\user_name\MyDocuments\MyGames\BattleTech\mods
-->LIN: /home/user_name/MyGames/BattleTech/mods
-->OSX: /Users/user_name/MyGames/BattleTech/mods

Other
Fixed an issue with Unity pathing related to Apple Notarization Fixed an issue where the AI displayed an assert toast message if the ally convoy unit had no ‘Mechs within its range Fixed a problem that prevented players from registering a new Paradox account

Known Issues
Removing a mod does not remove its entries from the MDD, players can delete the cache file manually

Roll Back
It is possible to revert to past versions of our game in case you have trouble. For more platform specific information go to our forums here.

As always, if you experience further issues please contact Customer Support at: https://support.paradoxplaza.com


Standalone installers, and those of all its DLC, updated: 1.8.0-629R ⇒ 1.8.1-640R.

Changelog for Update 1.9.0-680R (20 February 2020):

Thank you for playing BATTLETECH! Release 1.9 is now available on Steam, GOG, Humble, and Paradox Plaza. The main areas of improvement are: New ‘Mech and vehicle variants, gameplay options, Convoy AI, and mod support.

Release 1.9 Notes, 2/20/2020

‘Mech Variants
- Trebuchet TBT-7K
- Grand Dragon DRG-1G
- Warhammer WHM-7A
- Marauder MAD-2R
- Marauder MAD-3D
- Zeus ZEU-5T
- Zeus ZEU-6T
- BattleMaster BLR-1GB
- BattleMaster BLR-1S
- Crab CRB-27b
- Cyclops CP-10-HQ
- Javelin JVN-10A
- Raven RVN-3X
- Cataphract CTF-0X
- Phoenix Hawk PXH-1b-
- Rifleman RFL-4D

Vehicle Variants
- Striker Narc
- Scorpion Mk.II
- Schrek Snub PPC Carrier
- Galleon TAG
- Demolisher LBX
- Inferno Carrier
- Arvakr APC
- Alsvin APC-

Gameplay Options
- Added a Career Mode Difficulty Setting that allows players to reduce Argo upgrade costs
- Added a Settings option that allows players to speed up the real-world time it takes for an in-game day to pass
- Added a Settings option to assist those with color blindness allowing them to select alternate LOS lines and indirect fire colors

Mod Support
- The mod installation folder is now configurable
- The ModLoader is now patchable
- The ModLoader is now easier to use
- Added more Dynamic Enumerations
- Added more logging and error reporting
- DLC checks have been added to ModDef
- Fixed many other mod support related bugs
- Added several mod support quality of life improvements-

Convoy AI
- Fixed some long-range and short-range pathfinding issues -Escort vehicles can now move through the player’s ‘Mechs and each other -Killing the entire OpFor now auto-completes escort missions

Other
- Added a new ammo tab in stores and the ‘Mech Bay
- Half-ton machine gun ammo is now available
- +/++ variants of machine guns are now available
- Fixed an issue that prevented some players from being able to delete their GOG saves

Known Issues (to be fixed asap)
- The debug console, build number widget, and combat debug options cannot be evoked when using their corresponding shortcut combinations
- Under certain circumstances the game does not exit cleanly after saving

Roll Back
It is possible to revert to past versions of our game in case you have trouble. For more platform specific information go to our forums at: https://forum.paradoxplaza.com/forum/index.php?threads/how-to-rollback-to-a-previous-patch-version.1112335/

As always, if you experience further issues please contact Customer Support at: https://support.paradoxplaza.com


Standalone installers, and those of all its DLC, updated: 1.8.1-640R ⇒ 1.9.0-680R.

And there here it is, the last mayor Update :( ... still a game I do love alot :)

Best forum to ask this would be the paradox forums, where Creators are reading:
https://forum.paradoxplaza.com/forum/index.php?forums/battletech.994/

BATTLETECH 1.9.1 Update Release Notes, 02/25/2020

Fixes

Fixed an issue where under certain circumstances the game did not exit cleanly after saving
Fixed an instance of a visible debug string showing in place of a percentage value in the After Action Report and during some events
The mod support readme has been updated:
WIN: C:Usersuser_nameMyDocumentsMyGamesBattleTechmods
LIN: /home/user_name/MyGames/BattleTech/mods
OSX: /Users/user_name/MyGames/BattleTech/mods
HTTPS://forum.paradoxplaza.com/forum/index.php?threads/mod-support-readme-documentation.1285684/

Fixed an issue where mod names were displayed twice in the tooltip on the mod panel
Fixed an issue where one mod was not displayed in the list of required mods in the ‘Mods are missing or not enabled’ prompt
Fixed a date issue that would have prevented Paradox accounts from being created under certain conditions
The debug console, build number widget, and combat debug options can now be evoked when using their corresponding shortcut combinations
Fixed several visual map bugs

Standalone installers, and those of all its DLC, updated (1.9.0-680R ⇒ 1.9.1-686R): 03 March 2020.

There are issues downloading the standalone installer for the base game and the DLC - looks like the files have been duplicated 2 times.

I'm not seeing the standalone installer download duplicates - so looks like if there were duplicates shown for download then this has been fixed.