Did you had a look at the ContentErrors.txt file ?

[error.11]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.12]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.13]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.14]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.15]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.16]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.17]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.18]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.19]
error=Gauge/Script Error
Type: Gauge
Name: TW_Sys2
Error: Invalid variable (missing ':', did you forget a macro?): PROP BETA:1

[error.20]
error=Gauge/Script Error
Type: Gauge
Name: TW_Sys2
Error: Invalid variable (missing ':', did you forget a macro?): PROP BETA:1

[error.21]
error=Gauge/Script Error
Type: Gauge
Name: TW_Sys2
Error: Invalid variable (missing ':', did you forget a macro?): PROP BETA:2

[error.22]
error=Gauge/Script Error
Type: Gauge
Name: TW_Sys2
Error: Invalid variable (missing ':', did you forget a macro?): PROP BETA:2

[error.23]
error=Invalid "full_scale_dist" value in section "JET_WHINE.2.00" of file "E:\P3Dv5\SimObjects\Airplanes\Aerosoft_DHC6_300_WHEEL\sound\sound.cfg", value must be greater than zero.

[error.24]
error=Invalid "full_scale_dist" value in section "JET_WHINE.2.01" of file "E:\P3Dv5\SimObjects\Airplanes\Aerosoft_DHC6_300_WHEEL\sound\sound.cfg", value must be greater than zero.

[error.25]
error=Found Duplicate Key Name
File:E:\P3Dv5\SimObjects\Airplanes\TTA\aircraft.cfg
Section:General
Key:-----------------------------------------------------------------------

[error.26]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.27]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.28]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.29]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.30]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.31]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.32]
error=Failed to load visual effect "fx_Aerosoft_Twot_engfire "

[error.33]
error=Failed to load visual effect "fx_Aerosoft_Twot_engsmoke "

[error.34]
error=file "ss_twot_int_rpm1(.wav|.ogg)" not found

[error.35]
error=file "ss_twot_int_L_rpm2(.wav|.ogg)" not found

[error.36]
error=file "ss_twot_int_rpm_high(.wav|.ogg)" not found

[error.37]
error=file "ss_twot_int_turbine_rpm1(.wav|.ogg)" not found

[error.38]
error=file "ss_twot_int_turbine_rpm2(.wav|.ogg)" not found