This is my Version
freedroidRPG --version

Video system type: x11.
freedroidrpg 1.0  

Now, when i want to load a hero (it is from an older Version) the game crashed.

Could you please provide the backtrace dumped in the console ?

freedroidRPG 

Video system type: x11.
pixel format (shift/mask) : red: 16/0x00ff0000, green: 8/0x0000ff00, blue:
0/0x000000ff, alpha: 0/0x00000000
print_trace:  Obtained 16 stack frames.
print_trace:  Obtaining symbols now done.
freedroidRPG(print_trace+0x1c) [0x560c9668201c]
/lib/x86_64-linux-gnu/libc.so.6(+0x3c050) [0x7fd6b5152050]
/lib/x86_64-linux-gnu/libc.so.6(+0x1575ed) [0x7fd6b526d5ed]
freedroidRPG(filter_0_16_1_add_game_config+0x35) [0x560c966c6c95]
freedroidRPG(convert_old_savegame+0x187) [0x560c966c64a7]
freedroidRPG(+0x5b9a0) [0x560c966889a0]
freedroidRPG(load_named_game+0x34) [0x560c9667f4f4]
freedroidRPG(+0x528df) [0x560c9667f8df]
freedroidRPG(Single_Player_Menu+0x2e1) [0x560c9667fc31]
freedroidRPG(+0x52d77) [0x560c9667fd77]
freedroidRPG(+0x51d69) [0x560c9667ed69]
freedroidRPG(StartupMenu+0x45) [0x560c9667fe85]
freedroidRPG(main+0xe3) [0x560c9664b4e3]
/lib/x86_64-linux-gnu/libc.so.6(+0x2724a) [0x7fd6b513d24a]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7fd6b513d305]
freedroidRPG(_start+0x21) [0x560c9664b5d1]

print_trace():  received SIGSEGV!
Abgebrochen

thx.

could you please know run (from the directory containing the freedroidRPG binary):
addr2line -e freedroidRPG 0x560c966c6c95

/usr/games$ addr2line -e freedroidRPG 0x560c966c6c95
??:0

Nevermind, I can reproduce the crash with your savegame.
I'll work on it ASAP.

Hello again
Are there any new findings?

working on it, just now.

Unfortunately, there is (at least currently) no savegame conversion from 0.16 to 1.0. There are several changes introduced to reduce savegame incompatibility starting from 1.0.
I could try, if you really want, to manually fix your savegame, but anyhow you'll miss all the changes made to the world, so as the new "Act 2".
I would tend to advice you to start again to play...