Hello,
thank you for uploading the logs. I can see the issue with synchronization, seems that situation that couldn't happen did happen.
Could you please run a disk check on drive C:?

There is no error on drive C.

Could you try to restart the computer please and run Launcher after that?

Still corrupted and can't be repaired.

I've one blind shot: as it might be a permission problem, try to exit Steam (entirely, through menu Steam / Exit) and then run it again as administrator (right click on Steam icon and choose run as administrator) and then run Arma 3 Launcher.

I'm going to prepare an program that is going to check the mod and Steam files an track the mysterious file that exists and not exists at the same time and causing the problem.

Ok. I am waiting then. BTW should i redownload everytime I try something you say?

Could you please run a this program: http://arma.jiripolasek.com/files/tetriser_filescheck_v1.zip It will go through all files, do the same checks as Launcher and it will print results. If it detects an issue, it will also offer an option to delete the offending files (it will ask you and then wait for you to press Y (as Yes) before deleting anything).

And no, you don't have to re-download the mod, until it's solved it will be enough to re-start Launcher.

It's done and it didn't ask me anything but there is fatal error here. It's about Battle Royale and says something like " systemIOdirectionarynotfounexception: could not found a part of patch 'C:programfiles : steam : steamapps: common: arma3 : playerunknown's battle royale' and some more things.

Oh, sorry, my bad, I've made an error in a check. Could you please re-download the program and try that again?

No mysterious file. Done.

That's interesting :/ So the third time's a charm they say: this version of the program will also force the transfer of mod in the game directory http://arma.jiripolasek.com/files/tetriser_filescheck_v3.zip It might temporary solve your issue until I find the cause.

Yes. It says ready and partially signed. So will I wait for some more help from you? BTW Arma 3 is 32 bit. Is this normal?

Did the program listed any errors before transferring the files? Because at least on my computer that mod is fully signed, so there might be some files missing.

And yes, Arma 3 is 32 bit application.

No mysterious files again. BTW after loading mod, I entered the game again. There were three Battle Royal servers and all of them was red maybe it's because they are playing right now but the actual problem I couldn't enter other servers too. When i tried, i got a long text, it says there is a problem with key.

That seems that there are some files missing. Could you please run this program http://arma.jiripolasek.com/files/tetriser_BRMod_Diag.zip

It will create a file with the list of BattleRoyale files you have on your desktop, could you please upload that file here? I'll review it in the morning and compare it with the mod files that Steam downloads on my workstation.

OK I did. It's up ahead.

Thank you, but unfortunately it didn't cover nothing important. Could you please re-downloaded it and try that again? I've expanded the check and incorporated the list of expected mod files directly into the program, so the program is now able to tell you if there are some files missing or corrupted.

I uploaded. BTW It says signed (not partially) to the mod but when I enter the game with the mod, I can't play any other mod but BR.

Thank you. I can see that you the mod files are now intact, did you do something else to fix it?

Also if you run the game with a mod, you're basically changing the game rules and conditions (or it might), so the servers usually won't let you play with other mods than the ones they require.

No, only I downloaded the mod a few times. I've made some changes on parameters to boost FPS but nothing else.

I have downloaded 4 more mods and only one of them works correctly, others are corrupted again.

Hello,
could you please export Launcher logs again and also tell me which mods are corrupted? I'll update the diagnostic program to check all the mods in the meanwhile.

I have uploaded. I have downloaded CUP Weapons, Epoch,Jonzie Mega Mod PAck and TRYK's Multiplay Uniforms Pack. Only the last one works.

I can see the same error as with the Battle Royale mod. Could you please run this and upload the result: http://arma.jiripolasek.com/files/tetriser_allmods_diag.zip? Also what antivirus do you use?

I use 360 Total Security. I uploaded.

It's weird, but everything seems to be in complete order. I've tried to install the 360 Total Security and seems to me that it might be related as it is blocking the files for scanning, so it might cause the problem. Could you try to disable the antivirus temporarily, restart Launcher and see what happens?

No change. But BR still works after the app you sent.

Epoch mod ( and some more) was corrupted too. Then I downloaded it from other source than steam workshop. No problem now.