So, if you are not using CM with Custom Shader Patch, there is the reason why some mods won't work, like the Techart. For the Techart, for example, the CSP is mandatory, otherwise the mod won't work. This is also mentioned in the installation instructions from the Techart. Some mods are using some CSP features, like CSP physics and without CSP, AC is not able to load these mods. Thats the reason why your AC will crash, if you want start a race with these mods.
Is there a reason, why you don't want Content Manager and CSP?