There is a glitch in the Hoppah La mod 2.1 for Em4 stock, NOT deluxe. I have installed it on 5 different computers from win95c to win10 with various video cards, single and dual core proccesors, etc. Have updated video drivers, installed directx 9 runtime files, etc. All show same error. " Dynlight.vsf 3.0.0.0 or higher required " and an error about " constrsign does not contain version number" ! I have even tried downloading the mod from different places other than Hoppah's site. This is not a problem with video drivers, cards, proccessors, operating systems, etc. It is a problem that is mod related. Yes, running em4 version 1.3! No, there are no other mods installed, yes tried without usin shortcut, yes tried moving out of program files, just incase. Yes added exceptions to windows firewall, anti-virus, even tried while both were disabled. Ran as administrator, shut down every process possible thru task manager. Sometimes happens in 5 minutes, sometimes in 1 hour but error in log file always same. NO, I won't post log files from 5 different machines! No point. Basically it must be lived with, unless you want to run on machine with exact same hardware as Hoppah, and I would not even guarantee that. Just didn't want people wasting time trying to fix something that doesn't have a solution. I will try Em4 deluxe but sure it will have same problem. Oh yea and I was smart enough to install the correct version for Em4 specifically. Campaign seems fine but both free play ar fubar! Either a La map problem or just a mod problem. Really cool mod though, a lot of time was put into it and I want to congratulate Hoppah for all his hard work and effort. This is not a complaint about this mod, is meant to just save time looking for a fix. Hope this post does not offend anyone. It's still fun even if it does have a glitch. By the way win7 thru 10 also say " graphics card temporarily quit rrsponding" but I don't know what type of card to try unless there is one that supports higher than pixel shader 3.0 and you can afford it. Congrats on all the hard work that went into this mod.