The maps from Half-Life: Blue Shift are not compatible with SourceIO. This is because Gearbox modified the .bsp format that Blue Shift maps used, thus resulting in incompatibility with map decompilers and viewers. There are a couple of programs that are capable of fixing the issue by converting the maps into the standard .bsp format (i.e. bspfix), but I am unaware of any programs like these that have publicly accessible source code.
Here's a small sample size of Blue Shift maps, if that may be of help to you.
Blue Shift Maps.zip
REDxEYE
commented
6 months ago
The maps from Half-Life: Blue Shift are not compatible with SourceIO. This is because Gearbox modified the .bsp format that Blue Shift maps used, thus resulting in incompatibility with map decompilers and viewers. There are a couple of programs that are capable of fixing the issue by converting the maps into the standard .bsp format (i.e. bspfix), but I am unaware of any programs like these that have publicly accessible source code.
Here's a small sample size of Blue Shift maps, if that may be of help to you. Blue Shift Maps.zip