this is just what i heard, i am not accusing anyone here.
i am not that technical to know anything about it myself, just think if gog really are using
flt releases it's not a fine thing. hope there can be some clarification.

here someone has something to say about heroes chronicles : all chapters

The manual comes from Clash of the Dragons and in very poor quality. Soundtrack is identical to MP3 folder in the game folder. The main self-extracting archive called 'setup_heroes_chronicles.exe' utilizes Inno Setup Version 5.2.3 and can be unpacked by any compatible unpacker like innounp. Nothing to do with the original games here.
About game executables:
Chapter I.
Warlords.exe is identical to corresponding Cracked exe done by FAiRLiGHT(FLT) release group. The only difference between FLT and GoG executables: GoG removed the FLT title "$ID : KPE2K-SDKCR111-F21L03T2C0L0S000208A2F" from his exe. That's all!
Chapter II.
Underworld.exe is identical to corresponding Cracked exe done by FLT. The only difference between FLT and GoG executables: GoG removed the FLT title "$ID : KPE2K-SDKCR111-F21L03T2C0L0S000211945".
Chapter III.
Elements.exe is identical to corresponding Cracked exe done by FLT. The only difference between FLT and GoG executables: GoG removed the FLT title "$ID : KPE2K-SDKCR111-F21L03T2C0L0S0001F0CF3".
Chapter IV.
Dragons.exe is identical to corresponding Cracked exe done by csir.cjb.net (In my opinion the FLT executable is better. Ask GoG why he did not use the FLT executable). The only difference between csir.cjb.net and GoG executables: GoG removed the csir.cjb.net title "unwrapped with unSafedisc - csir.cjb.net -" from his exe. That's all!
Chapter V.
WorldTree.exe is not identical to original executable. From GoG executable 43 bytes of code have been removed. Why? Ask GoG!
Chapter VI.
FieryMoon.exe is almost identical to original executable. Only CD check (6 bytes) have been removed.
The Final Chapters.
Chapter VII.
Beastmaster.exe is identical to corresponding Cracked exe done by 'Cama of Tribunal' Crackers team for GameCopyWorld (In my opinion the FLT executable is better. Ask GoG why he did not use the FLT executable). The only difference between 'Cama of Tribunal' and GoG executables: GoG removed the 'Cama of Tribunal' title "-razor 1911 rtl-" from his exe.
Chapter VIII.
Sword.exe is identical to corresponding Cracked exe done by 'Cama of Tribunal' Crackers team for GameCopyWorld (In my opinion the FLT executable is better. Ask GoG why he did not use the FLT executable). The only difference between 'Cama of Tribunal' and GoG executables: GoG removed the 'Cama of Tribunal' title " nofear " from his exe. That's all.

Summary. All executable modules (except Chapters V-VI) have been stolen from various crackers and (except only Chapter VI) has nothing to do with the original.

P.S.
1. GoG mistakenly put in his self-extracting archive the file Hchron_1.vid from German game release. English file is missing.
2. Hchron.vid file (with ingame video) is homemade.