Hi Drake,
The user "PSR_E473 (Salman)" did not mention on which keyboard he would like to use this style. He probably needs the style in SFF1 format. However, the MegaHit style you edited/linked is in SFF2 format.
According to the Owner's Manual, the PSR-E473 can only load (SFF1) styles with a maximum size of 50 KB. After a test conversion to SFF1 with the "Style Format 2 Converter" program, this style still has 81 KB. In order to get under 50 KB, you would have to edit the style further, e.g. delete style sections that are not required.
Best regards,
Chris