To download historical bhavcopy just mention the date in numeric format(Date, Month, Year). Note that date should be mentioned in quotation mark "" (inverted comma).
# Example
library(nser)
report = bhav("01072021")
head(report)
#> SYMBOL SERIES OPEN HIGH LOW CLOSE LAST PREVCLOSE
#> 1 20MICRONS EQ 60.45 60.75 59.20 59.45 60.50 60.15
#> 2 21STCENMGM EQ 23.05 23.05 23.00 23.05 23.05 22.60
#> 3 396GS2022 GS 81.38 81.38 81.38 81.38 81.38 77.51
#> 4 3IINFOTECH BE 10.00 10.15 9.55 9.90 9.95 9.85
#> 5 3MINDIA EQ 24360.00 24599.35 24250.00 24315.35 24350.00 24331.55
#> 6 3PLAND EQ 12.90 13.40 12.30 12.95 13.05 12.95
#> TOTTRDQTY TOTTRDVAL TIMESTAMP TOTALTRADES ISIN X
#> 1 149027 8906267.1 01-JUL-2021 1902 INE144J01027 NA
#> 2 13436 309674.3 01-JUL-2021 159 INE253B01015 NA
#> 3 100 8138.0 01-JUL-2021 1 IN0020200260 NA
#> 4 9271261 90736570.4 01-JUL-2021 10307 INE748C01020 NA
#> 5 1236 30144028.8 01-JUL-2021 774 INE470A01017 NA
#> 6 16112 208120.0 01-JUL-2021 111 INE105C01023 NA