Classic heisters, Rejoice! Now your favorite game version will have SuperBLT support.
Working self-updates, convinent interface, but does not have supermods and resource replacement support. Shame.

Plug'n'Play Installation:

• Download PreU79 SuperBLT Setup or PostU79 SuperBLT Setup
• Extract the archive on your freshly installed old version of the game.
• Launch the executable payday2_win32_release.exe and Play.

Manual Installation:

• Find the IPHLPAPI.dll file that working on your version. Look for the dates your update was released in this table, compare with date of the released BLT's and download one)
• Freshly installed SuperBLT's base folder is extracted into the mods, you can take it from vanilla version or download it manually here.
• Make sure that downloads, logs and saves folders exist in the mods, empty or full doesn't matter. Without it game will start working incorrectly.
• Put this SuperBLT-Classic-Updates-Support-main into the mods.
• Create txt file in the game folder of your old update, name it steam_appid.txt, and type 218620 in the first line of this file and save it.
  (When this file is inside your game folder, you'll be able to launch the game using an executable file away from the common folder. That means you can play the modern version and the old one separately. Both will launch through Steam.)

Version 6

1. Reworked Components management.

The missing components that were necessary for SuperBLT to work are now being picked up via require.

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2. Mod now detects specific issues in SuperBLT's code, fixes it and unfixes on specific game versions.

Comments, corrects, or supplements for better compatibility on a particular version of the game. It also detects problems in BeardLib.

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3. (Experimental) Added BeardLib support. It's not fully functional yet, it only works with experimental WSOCK32.dll\IPHLPAPI.dll provided by test1 and HW12Dev and only on a few versions of the game. (Go get one, join Original Pack Discord or ask me)

Experimental WSOCK32.dll\IPHLPAPI.dll It has been tested on versions 37.1, 24.2 and 10. They may work on some other versions, but on 37.1 are already has some problems with loading custom files.
Custom soundtracks, sounds, models, textures is working.
Custom maps are not working at the moment, they crash while the map is loading. The same with the BeardLib Editor, the interface works, but map loading crashes the game.
early-pd2-superblt Source

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4. QoL feature.

Multichoice options now open dialog with options list like in modern version of the game.

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Added some components than may fix some mods from vanilla game to the classic versions.
Maybe I will add a few more in the future. (Mutators and CrimeSpree too 💀)

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Thanks to the BLT team who made this amazing tool, people have been using it since 2015 and until now.
Thanks to all the Original Crew and Classic Heisters, who have ever been interested in the old PAYDAY 2. Also, to RedFlame the Biggest contributor of old Payday and head of all of this.

You can hang out with us in our Discord server to play some old updates. Mostly playing U37.1, but also sometimes in U24.2, U52.3 and U76. Also, you can choose your favorite version from this list and ask some one to download it.