The conversion of the project was successful.

The new directory structure is as follows:

E:/TEXTBOOK/PSPICE AUG 19 2008/CHAPTER 3
    Controlled Half-wave Rectifier with SCR.opj
    controlled half-wave rectifier with scr.dsn
    controlled half-wave rectifier with scr.dbk
E:/TEXTBOOK/PSPICE AUG 19 2008/CHAPTER 3/Controlled Half-wave Rectifier with SCR-PSpiceFiles
    controlled half-wave rectifier with scr.lib
    controlled half-wave rectifier with scr.olb
    controlled half-wave rectifier with scr.err
    controlled half-wave rectifier with scr.ind
E:/TEXTBOOK/PSPICE AUG 19 2008/CHAPTER 3/Controlled Half-wave Rectifier with SCR-PSpiceFiles/SCHEMATIC1
    SCHEMATIC1.net
    1.sim
    SCHEMATIC1.als
E:/TEXTBOOK/PSPICE AUG 19 2008/CHAPTER 3/Controlled Half-wave Rectifier with SCR-PSpiceFiles/SCHEMATIC1/1
    1.dat
    1.out
    1.prb
    1.mrk
    1.1op
    1.cir
    1.mif
