If the object turns to pink when you open the blend file.

-go to File>External Data>Find Missing Files and navigate to the texture folder.

To import into your scene.

-easiest way is just select the object/s or collection/s press ctrl+c (copy) and paste it into your project scene.

or

-go to File > Append,
-navigate to .blend files folder,
-open the file,
-open Object folder,
-select the the object name and click append.