Use these md5 checksums or /etc/system_build_date to identify which update you have:

see 0_BionicPup32_New_Generation_README.txt for builds after +30

e6a1f201f7f3c506a694330167fd69c3  bionicpup32-8.0+30-uefi.iso System built on: Fri Apr 8 11:51:58 +08 2022
1ea361a89013b3c955a4368091093952  bionicpup32-8.0+29-uefi.iso System built on: Fri Dec 24 11:47:59 GMT 2021
af3e0badd522add6d50058bffb94ad4b  bionicpup32-8.0+28-uefi.iso System built on: Thu Jun 24 10:08:31 BST 2021
8787b8e496ee61fccb1d09b14138110c  bionicpup32-8.0+27-uefi.iso System built on: Sun May 16 15:14:16 BST 2021
52f777057520b73f06ae6bca26e355e5  bionicpup32-8.0+26-uefi.iso System built on: Wed Feb 24 07:26:01 GMT 2021
33ce5eacd4dc638336fa720b2f739e9e  bionicpup32-8.0+25-uefi.iso System built on: Sat Jan 2 11:59:05 GMT 2021
14d50147701a6c0de34e746e0c66962e  bionicpup32-8.0+24-uefi.iso System built on: Fri Sep 25 09:57:02 BST 2020
510c2d008b920ddcb088d9c977282663  bionicpup32-8.0+23-uefi.iso System built on: Sat Aug 15 10:02:42 BST 2020
0eb56b91ef855aa7bec37e3aa63d0b01  bionicpup32-8.0+22-uefi.iso System built on: Sat Jun 27 14:31:52 BST 2020
0f5d8c73acc416d1fa67ebcad43c74b7  bionicpup32-8.0+21-uefi.iso System built on: Fri May 8 10:20:37 BST 2020
dbf1b6dd0e9a5bdfdc7662eb0820a46d  bionicpup32-8.0+20-uefi.iso System built on: Sat Apr 18 10:05:23 BST 2020
9610a1bc7d30e12979d2fd0dbd985859  bionicpup32-8.0+19-uefi.iso System built on: Sun Mar 15 07:37:18 GMT 2020
076423d6bc6fcd5236c73f7d1490e5d0  bionicpup32-8.0+18-uefi.iso System built on: Sun Feb 16 08:54:29 GMT 2020
c11a94d8eeb39e7c00dfea177796b745  bionicpup32-8.0+17-uefi.iso System built on: Fri Jan 10 10:50:34 GMT 2020
436b12d16e78eacfa5e2bdc672c8acab  bionicpup32-8.0+16-uefi.iso System built on: Sat Dec 21 10:53:29 GMT 2019
094be0b91c22c426526682fd61e9ebf0  bionicpup32-8.0+15-uefi.iso System built on: Fri Nov 22 11:11:02 GMT 2019
cff49b7f8e5ff7925c00e158cdfe5dc1  bionicpup32-8.0+14-uefi.iso System built on: Sun Oct 20 12:28:20 BST 2019
52a591deae87d71fe88451a392cc8564  bionicpup32-8.0+13-uefi.iso System built on: Sat Oct 5 09:34:22 BST 2019
6637fd6c4fd25bac314cb1a4ab4f4c40  bionicpup32-8.0+12-uefi.iso System built on: Sun Sep 15 10:14:22 BST 2019
7cf3b9b9813ba4261553c3a673ed663c  bionicpup32-8.0+11-uefi.iso System built on: Tue Aug 13 08:35:49 BST 2019
0325082c674e84e98d7da84f7dea52e0  bionicpup32-8.0+10-uefi.iso System built on: Sat Aug 3 10:36:25 BST 2019
6794642414a878423b680c4346cb9eed  bionicpup32-8.0+9-uefi.iso System built on: Sun Jul 28 12:27:06 BST 2019
f47226a217c1937598dd42224316b63f  bionicpup32-8.0+8-uefi.iso System built on: Fri Jul 12 11:59:59 BST 2019
c6e74041226ff54736528bfddc72fd7e  bionicpup32-8.0+7-uefi.iso System built on: Fri Jun 14 10:03:20 BST 2019
bffd1a3ae09c7bffd5a40a69a452c5ab  bionicpup32-8.0+6-uefi.iso System built on: Mon May 27 15:23:26 BST 2019
1d3401a56b750cb8589b88015f098fd4  bionicpup32-8.0+5-uefi.iso System built on: Sat May 11 12:29:49 BST 2019
1cdac85a2732527433139b0746e89127  bionicpup32-8.0+4-uefi.iso System built on: Tue May 7 15:44:10 BST 2019
0260b7c401c69f050c82db6cb77e1c17  bionicpup32-8.0+3-uefi.iso System built on: Mon Apr 15 12:03:21 BST 2019
613f1677958fd64bdc58187fe92d8cbb  bionicpup32-8.0+2-uefi.iso System built on: Sun Apr 7 10:14:34 BST 2019
0aea9310fbb3f1324767bac2fd64eb54  bionicpup32-8.0+1-uefi.iso System built on: Mon Mar 25 06:58:02 GMT 2019

Base iso:
9d753e2dffd49beaba80751e87a45c3f  bionicpup32-8.0+0-uefi.iso (obtainable from SourceForge) System built on: Sat Mar 16 12:42:51 GMT 2019