Welcome to the discourse.
Maybe the new Intel oneAPI compilers will work, if I recall correctly they have a long history starting from Digital Visual Fortran at some point. With the current backwards compatibility policy present in Fortran compilers, chances are good that it might still work.
The Base+HPC toolkit should provide you with the ifort compiler (Intel® oneAPI Toolkits), fortunately Intel currently provides their compilers free of charge. So it might be worth a try.