Good job goguser28848 !

Posting a list of changes to common.dll if anyone wants to edit it themselves. This means you must have the same version as me. You can check that by running a SHA1 hash of your common.dll and comparing that hash to mine below. Make a backup of the original file before making changes to it. If you don't feel comfortable making these edits yourself, I can post the patched version with these changes, but I'm not going to if I'm not allowed to. I don't know if it's ok to post patch files here.

SHA1 hash of my original common.dll (from LiS: Complete Season - gog version 1.0.0.397609_(38128)) =
ba158c81c082184488caabf8e7e26453edf2030f

It works! You are my hero! It also works in other chapters. Thank you very much!

For me the gazdi fix did the job. Running an i7 2600K intel.

No online services available in the game though... not sure if its related.
Otherwise game now runs fine.

Hey gazdi, what's the SHA1 hash of your original common.dll? I'm curious to see if it's the same version as mine. Also, what gog version of the game do you have and what CPU do you have?

Someone fix to Windows10 (64X)?
Wait return

Exact same hash and version as yours.
I replaced three AVX2 instructions that my processor i5-3570k (with AVX support) could not understand. Your patch should help older processors (without AVX) owners.

Ah, ok, that makes more sense. Mine is an older i7-970 (don't judge, it's still a very capable processor, lol) with no AVX.
Fun fact: steam_api64.dll (in BtS) also has AVX2 instructions in it (inside SteamAPI_Init function), but it has better exception handling and is able to continue, but since it failed to init the steamAPI properly, anything that relies on it (like DLC check) will crash it.

if it even can help:

the recent fixed common.dll with the edits suggested here (and that a gog support person sent me by email too as a fix) ended up having Life is Strange 1 launch and work on an old Intel Core i5 equipped laptop (laptop is from 2013, i can dig up a bit more to find which model of core i5 it is) (but the laptop aint much equipped gpu side, so the game runs poorly, but it launches)

however, this first step fixed common/dll was not enough to have the game launch on my regular computer (the one that has a gpu powerful enough for the game). This computer has an intel Dual Core G4400.

so... old Core i5 = currently edited/fixed common.dll works now... 2016's Dual Core G4400 still cannot run the game.

if you need some logs or whatever if it can help you, feel free to ask...

Still, it would be great the gog tech team would follow your lead about cpu's sets of instructions making common.dll crash to fix that themselves. I mean it's not fair from us to rely too much on you alone
also, not familiar with that, so, i'll ask:

which too do i use to check the hash of my own common.dll prior to editing the changes you documented here ?
also which hex editor did you use/do you recomand so that i can see the offset position i would be currently editing ?

thank you in advance

HashCalc for hashing
HxD for hex editing

The model will help identify if your cpu has AVX. Your dual core G4400 doesn't have AVX so you need to use my patch.

I have just updated game and now it works on my old i5 750.

Game still works after the update so they either fixed it entirely didn't touch ethe edited .dll.
Anyone got a changelog?:)

Looks like they re-compiled their steam wrapper dlls (common.dll and steam_api64.dll) without AVX instructions.

OMG thanx to your own patch it finally worked fine !
you are a life savior, i cant know how to thank you
i hope gog tech team will follow your leads on the bug and correct/fix their dll acordingly, and aside from that, i also hope they will thank you as well for the help you provided to the community, you and the OP here

huge sincere thanx to both of you

(and thanx also to gog tech support who did what they could...)

A patch has arrived! Thanks GOG for this.. Better than hacking hex...