# Installing older versions fails due to inaccessible regression test **URL:** \ **Category:** User discussions\ **Tags:** installation-error\ **Created:** [July 24, 2022, 12:18am UTC](https://gromacs.bioexcel.eu/t/installing-older-versions-fails-due-to-inaccessible-regression-test/4502 "2022-07-24T00:18:46Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ck300](https://avatars.discourse-cdn.com/v4/letter/c/bc8723/32.png) [@ck300](https://gromacs.bioexcel.eu/u/ck300)\ **Post date:** [July 24, 2022, 12:18am UTC](https://gromacs.bioexcel.eu/t/installing-older-versions-fails-due-to-inaccessible-regression-test/4502/1 "2022-07-24T00:18:46Z")
GROMACS version: Anything before 2021 GROMACS modification: No I’m trying to install GROMACS via CLI on Linux. I’ve noticed that following the [install steps](https://manual.gromacs.org/documentation/2019.5/install-guide/index.html), I get the same issue for several different versions at this step: cmake … -DGMX\_BUILD\_OWN\_FFTW=ON -DREGRESSIONTEST\_DOWNLOAD=ON Namely, it cannot download the regression file. If you go to the [download page](https://manual.gromacs.org/documentation/2019.5/download.html) for one of these pre-2021 releases, I noticed that all of the regression test links (1) have a link like this: http://\*\*gerrit.\*\*gromacs.or (can’t put \>2 links, so I shortened URL) and (2) if you click on them you get a 403 forbidden error. On a newer, 2021-and-later GROMACS version, the regression test link is like this: https:// **ftp**.gromacs.or And clicking the link works (likewise, the CLI install process works as well). Swapping the “gerrit” for “ftp” doesn’t work in the original case. I know these older versions are no longer supported, but wondering if there is a way to install them still? I need them to run some code that worked on an older version (has the “Group” cutoff-scheme, but the newer ones only accept “Verlet”… but that throws off the program given the other parameters in the \*.mdp file). Also I tried the version in this question ( gromacs.bioexcel.eu/t/unable-to-install-older-version-of-gromacs/4230), and ran into the same issue with the group cutoff-scheme. ---
**Author:** ![alevilla](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/alevilla/32/439_2.png) [@alevilla](https://gromacs.bioexcel.eu/u/alevilla)\ **Post date:** [July 25, 2022, 12:56pm UTC](https://gromacs.bioexcel.eu/t/installing-older-versions-fails-due-to-inaccessible-regression-test/4502/2 "2022-07-25T12:56:15Z")
Hi, Concerning the regression tests, you can find the regression test for the version 2020.4 and older by looking at [https://ftp.gromacs.org/regressiontests/](https://ftp.gromacs.org/regressiontests/) then select [regressiontests-XXXX.X.tar.gz] corresponding to the version you look for.(e.i for version 2020.3 [https://ftp.gromacs.org/regressiontests/regressiontests-2020.3.tar.gz](https://ftp.gromacs.org/regressiontests/regressiontests-2020.3.tar.gz)). I hope it works. \Alessandra ---
**Author:** ![ck300](https://avatars.discourse-cdn.com/v4/letter/c/bc8723/32.png) [@ck300](https://gromacs.bioexcel.eu/u/ck300)\ **Post date:** [July 28, 2022, 10:05pm UTC](https://gromacs.bioexcel.eu/t/installing-older-versions-fails-due-to-inaccessible-regression-test/4502/3 "2022-07-28T22:05:34Z")
Hello, that worked for me! I think. I ran the install process without the regression tests, and then ran it afterwards inside the regression test folder ---
**Author:** ![Sayan](https://avatars.discourse-cdn.com/v4/letter/s/8dc957/32.png) [@Sayan](https://gromacs.bioexcel.eu/u/Sayan)\ **Post date:** [March 9, 2023, 4:54pm UTC](https://gromacs.bioexcel.eu/t/installing-older-versions-fails-due-to-inaccessible-regression-test/4502/4 "2023-03-09T16:54:09Z")
Can u say what u did after downloading the regression test step wise ---
**Author:** ![Sayan](https://avatars.discourse-cdn.com/v4/letter/s/8dc957/32.png) [@Sayan](https://gromacs.bioexcel.eu/u/Sayan)\ **Post date:** [March 9, 2023, 7:44pm UTC](https://gromacs.bioexcel.eu/t/installing-older-versions-fails-due-to-inaccessible-regression-test/4502/5 "2023-03-09T19:44:10Z")
Please tell me the steps