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Updating LMS - how to fix splmsupdater.php fatal error?

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Hi there! We have been using SP LMS in Helix 3 since 2016 and we had many problems along the way, last one being a problem with LMS course purchase email confirmations ... I was not able to resolve it last year with Rifat, so we stopped development for a while considering even custom building the LMS site ...

Since the price of custom building LMS site is high, we decided to renew JoomShaper license a couple months ago and I finally had some time to setup another test site to see if I can update Helix 3, Page Builder and SP LMS to see if that would help and fix the problems. I manually updated Helix 3 (from v2.3 to 2.5.6) and Page Builder (from 2.5.4 to 3.4.1), but when I tried to apply SP LMS update (from 2.2. to 3.2), I got the following FATAL ERROR:

Fatal error: Cannot declare class plgSystemSplmsupdater, because the name is already in use in /home/pmexpert/public_html/IM-test-site/plugins/system/splmsupdater/splmsupdater.php on line 52

The site is down (front end and back end), it just shows that error ... you can see it for yourself here:

Is that a common error and how can I fix this error and finish installing SP LMS update to try the new version?

The live site with old versions is here:
I would like to update and test SP LMS on the test site first before I proceed to the live site ...

Please help me with this ASAP.
Thanks, Danijel

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