The assets with the envmap1 error are missing the file envmap1.tga . It's available at kuid2:2512:3380:1, just copy the file to where it's missing.
The att-parent error is a result of the assets being aliases, the content manager can't check for the attachment points. Open for edit in explorer and open the config.txt. Search for the position where the att-parent is missing (ex. couple0 ), and before the line with attachment point (ex. att "a.forward") insert a line att-parent "default".
The missing 1460blue_trs.tga is available at kuid2:2512:3385:1 .
The interior asset has an illegal mesh "main.im" line at the beginning of the config.txt, delete the line.
The enginespecs have an illegal scale 1 line in the config.txt (at the beginning of the flowsize container), delete it.
Peter