Not all information in the Install Guides is current, especially about transferring PCs from EoB2 to EoB3.
Kattus from Gog forums explained how to transfer characters from EoB2 to EoB3:https://www.gog.com/forum/forgotten_realms_collection/transferring_eye_of_the_beholder_party_to_next_part
From EoB 1 to 2:
-Copy EoBdata.sav file from EoB1 directory to EoB2 directory.
-Run EoB2 and choose "Transfer EoB1 Party" from main menu.
From EoB 2 to 3:
-Copy "final.sav" from EoB2 directory to EoB3 directory, it is automatically created when you win EoB2. Or you can transfer any savegame, just copy "EoBdataX.sav" to EoB3 directory.
-Run "charcopy.exe" which is located in EoB3 directory. Notice that you can only transfer first four characters of your party. If you want to take specific characters to EoB3 you must arrange your party beforehand in EoB2.
Alternatively you can skip the Charcopy program and just copy savegame of your choice to the main EoB3 directory and rename it to "TRANSFER.SAV"
Run game and choose "Summon the Heroes of Darkmoon" from main menu.
(I altered spelling and punctuation to my taste. Ishad Nha)
For EoB2 to EoB3, second idea is easy to use in practice. I could not get Charcopy.exe to run on Windows 10.
You always start EoB2/EoB3 with no spells memorized?! This makes no sense, since the end of their last EoB adventure the party had plenty of time to rest.
All Seeing Eye can help for EoB2 and the UGE program for EoB3.
"Automapper Utility for Eye of the Beholder 1 & 2" describes working with ASE and provides a link to it, see:http://ua.reonis.com/index.php?topic=3423.0
For an understanding of UGE, see the "UGE - FRUA Hacking" topic, which has been made sticky at the top of this forum.
"Topic: Eye of the Beholder III Hub" has a link to the module and notes about how to use it, see:http://ua.reonis.com/index.php?topic=3417.0