Apex won't launch due to steamclient64.dll

[bloodmanA2]

Apex won't launch due to steamclient64.dll - 

Windows error from Easy Anti Cheat:

Easy Anti-Cheat

Untrusted system file
Files: steamclient64.dll

Error from Steam window:

" -steam -steam -eac_executablename "R5Apex.exe" -eac_executablename

"R5Apex.exe""

[UzumakiTeto · Accepted solution]

After closing and re-opening my steam 10mins prior, I've just received a steam update, rolling back to it's previous update as they address the Anti-Cheat issue affecting various games.

Hopefully everyone's gucci now 

[bloodmanA2]

@bloodmanA2 Clearing Steam cache also did not help resolve the issue.

[bloodmanA2]

@bloodmanA2 Also tried reinstalling the game.

[Solid_EXC]

same issue after steam update !.

I have a ticket support in EAC meanwile downloading Origin version.

EAC dont have that new dll of steam and have that issue.

[AquamarineDareen]

I have the same issue,Tried repairing local files, tried repairing then reinstalling easy anti cheat,updating steam,my antivirus,stopping my anti virus for a second nothing worked

[ShowMeTDss]

Following this. Played earlier just fine until now, don't know what the issue is.

[buildthegates]

Also having the same issue cant open apex

EDIT: I seem to have found a fix

1. make sure your steam is completely closed

2. go to C:\Program Files (x86)\Steam\steamapps\common\Apex Legends\EasyAntiCheat or wherever your game files are located

3. delete the certificates folder

4. run EasyAntiCheat_Setup.exe and select apex legends and repair service

5. try running apex again

This is what worked for me for now at least

[Zesty_Elliott]

pretty sure that 

Untrusted system file
Files: steamclient64.dll

and "optional parameters"  (-steam -eac_executablename "R5Apex.exe")

Are actually two different issues.

1. new steam client isn't in the anti-cheat white list yet 

2. new steam client has a bug that is registering the default params as extra optional params.
     then when you click "ok" it accepts them and the re-wraps with the default params again so you get
     '-steam <approved optional params> -eac_executablename "R5Apex.exe"'
     aka '-steam -steam -eac_executablename "R5Apex.exe -eac_executablename "R5Apex.exe'

Edit:
My bro ran into this first, I was able to play apex through steam fine but downloaded the new steam client to confirm that that would give me the same issue. it did.

you can appease the anti-cheat by deleting the specified file (steam will reinstall it on restart) but I don't have a work around for the issue with approving the "optional parameters".

Edit 2: Bro can launch via origin without issue, just not via steam.

[Cuakyn]

same thing happening to me, verified files, deleted steamclient64.dll, nothing works. I was playing today everything ok but after steam update game won't run

[xmunroe3155]

Same issues with mine, went through all of the steam repair options, but no dice.