Hi Flomo,
I have an observation that component TIdFTP from Indy10 package 10.6.2.5440 crashes when used in 64 bit environment (tested in win 7/64, lazarus 1.8.0, FPC 3.0.4 win64/win64 and linux mint 18.3 64 bit, lazarus 1.8.0, FPC 3.0.4, x86_64, gtk2).
What is (not) strange this component works as expected when used in 32 bit version (win 7/64, lazarus 1.8.0, FPC 3.0.4 win32-win32/64).
I tried also Indy10 package updated version 10.6.2.5444 from the global repository - it has the same crippled component TIdFTP.