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Just repeat steps 1 and 2 to switch to a different version if you keep several around. Note: in principle running vrstartup should be enough to switch, but this doesn’t seem to be supported by all versions of SteamVR.
Alternative
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versions provided by Steam
Finally, Steam provides a number of specific version on their “Beta” track. Of particular interest is that they offer version 1.15.12 which prevents some breakage to our drivers that was introduced in the 1.16 releases. If you are using SteamVR from Steam, you can select this as follows:
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