That makes no sense. All Blood Omen games on GOG has cloud, expect for this game.
Any reason behind this?


Worse issue. I already have whole series series on Steam, sadly theres no cloud in Steam versions at all. I wanted to buy complete series here on GOG during sale, but now I cant even find Legacy of Kain 1 here anymore, no reason to own first part of story + 3rd,4th and 5th!

GOG Games just silently missing or cant be run anymore while GOG keep selling them. GOG is turning into no more good old games.

Some games got lost their Cloud support, just without any theoretical reason. Some lost it in re-releases of any kind.
That one maybe one of them.

SR1 are definitely one of them. It have Cloud lost it have again and lost. There was update that got reverted (change log can be found on 3rd party sites but not on GOGDB info). One of changes was Cloud support reenabling but it was lie and it did not reenables.

SR1 are unavailable doe to some reasons for long time. Legal too. Removing it from store already happened before, before GOG and Steam releases (old digital stores, incl consoles).

Blood Omen 2 didnt fit LoK series plot, barely fit it as "alternate universe in alternate timeline unrelated to main SR-Defiance trilogy".

Hmm, nevermind, Steam version works too and in worst case i still should have an original CD boxes with old Soul Reavers somewhere on my bookshelf.

If you already bought GOG you have version Steam based on. If you have Steam version you have identical to GOG-Galaxy version (not counting steam related differences like installscript.vdf file or something).

You can find that one rollbacked update for offline GOG build (from Galaxy it was removed even from version rollback history) on some sites.

There is a point to do that. GOG/Galaxy/Steam version is based on fan-made patch and video converted to bink by fan. Although by some mistake intro are from some promo materials and omitted few frames. Newer version restore original videos. And include GOG own GOG DX Wrapper for render and input (render can be configured by DXCFG.exe, technically there is ini file for input but as i understand it - better not touch it as its already setup for Xbox/PS DS pads, just bind controls in game pre-Launcher/game settings).
Similar to GOGs Blood Omen 1 release. Each game got own build of wrapper. Some older releases/update releases got only render wrapper. Input are newer (since BO1 i guess, its hard to say no official game list or fhangelog for Wrapper separately of games changelogs).
So they have similar but differ versions of same Wrapper.

In any case you have working version if you bought at least one. Wrappers or not - some tweaks for FPS limit and Gamepad and all LoK games on GOG+Steam work perfectly fine.

The only kinda mandatory is KainGL for BO1 by Verok. GOG use same slowdown way as old fixes. Sometimes game speed up its FPS.
KainGL make FPS more stable and increase it so 59,9 instead of 23,9 as is GOG or old fix+crack do most the times.

For SR1 look here
http://www.gog.com/forum/legacy_of_kain_series/what_happened_to_soul_reaver_1/post5
And to Post9 of pinned Changelog thread.

For BO2 and Cloud support look to PCGW articles about LOK games and to Glossary_CloudSaves linked in the table of (un-)available Cloud service on BO2 article.
You can get directly to BO2 page of PCGW from GOG-Galaxy-Library-BO2 game-MORE-Support-Additional info on PCGW