I have re-run and compared three sets of transit data through HOPS using the latest Anaconda – Python 3.8.3 distribution against the previous Anaconda – Python 3.7.6 distribution and the output from HOPS is identical with no issues found on Windows 10 build 2004 or macOS Catalina. I’m not currently able to test on a Linux build or earlier builds of Windows 10 or macOS.
Based on this (limited) test I would say it is ok to use the latest Anaconda – Python 3.8.3 distribution as a platform for HOPS using Windows 10 build 2004 or macOS Catalina.
The installation guide for Anaconda – Python – HOPS contained in appendix A of Roger Dymock’s Ariel Space Mission document remains valid with only the need to account for the latest version numbers of Anaconda and Python in the text and figures:
Ultimately though it is the responsibility of the HOPS software author to test against a new release of Anaconda – Python, which historically occur two or three times per year, and revise the HOPS release build and instructions accordingly. All the previous versions of Anaconda – Python are available should you wish to install and run HOPS in it’s original build environment:
Regarding using AstroImageJ for exoplanet detection you will find Roger’s exoplanet section here on the BAA website contains links to all the information you require:
Roger’s page provides web links out to the most relevant sites, I would suggest beginning with the Grady Boyce – Dennis Conti Cookbook and guides and the latest release of AstroImageJ: